1396806840 has 384 divisors, whose sum is σ = 5465940480. Its totient is φ = 304819200.

The previous prime is 1396806823. The next prime is 1396806841. The reversal of 1396806840 is 486086931.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396806841) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 2213325 + ... + 2213955.

It is an arithmetic number, because the mean of its divisors is an integer number (14234220).

Almost surely, 2^1396806840 is an apocalyptic number.

1396806840 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 1396806840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2732970240).

1396806840 is an abundant number, since it is smaller than the sum of its proper divisors (4069133640).

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

1396806840 is a wasteful number, since it uses less digits than its factorization.

1396806840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1396806840 is about 37373.8791136269. The cubic root of 1396806840 is about 1117.8377820691.

The spelling of 1396806840 in words is "one billion, three hundred ninety-six million, eight hundred six thousand, eight hundred forty".