1396666368 has 208 divisors, whose sum is σ = 4218692640. Its totient is φ = 456523776.

The previous prime is 1396666357. The next prime is 1396666373. The reversal of 1396666368 is 8636666931.

It is a super-3 number, since 3×1396666368³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8073130 + ... + 8073302.

Almost surely, 2^1396666368 is an apocalyptic number.

1396666368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1396666368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109346320).

1396666368 is an abundant number, since it is smaller than the sum of its proper divisors (2822026272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1396666368 is an equidigital number, since it uses as much as digits as its factorization.

1396666368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 251 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 54.

The square root of 1396666368 is about 37371.9997859360. Note that the first 3 decimals coincide. The cubic root of 1396666368 is about 1117.8003084618.

The spelling of 1396666368 in words is "one billion, three hundred ninety-six million, six hundred sixty-six thousand, three hundred sixty-eight".