1396889280 has 224 divisors, whose sum is σ = 4977262080. Its totient is φ = 368778240.

The previous prime is 1396889279. The next prime is 1396889321. The reversal of 1396889280 is 829886931.

It is a happy number.

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

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 31 ways as a sum of consecutive naturals, for example, 923725 + ... + 925235.

It is an arithmetic number, because the mean of its divisors is an integer number (22219920).

Almost surely, 2^1396889280 is an apocalyptic number.

1396889280 is a gapful number since it is divisible by the number (10) 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 1396889280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2488631040).

1396889280 is an abundant number, since it is smaller than the sum of its proper divisors (3580372800).

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

1396889280 is a wasteful number, since it uses less digits than its factorization.

1396889280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 1396889280 is about 37374.9820066846. The cubic root of 1396889280 is about 1117.8597733546.

The spelling of 1396889280 in words is "one billion, three hundred ninety-six million, eight hundred eighty-nine thousand, two hundred eighty".