1397651856 has 120 divisors (see below), whose sum is σ = 3974433120. Its totient is φ = 422028288.

The previous prime is 1397651851. The next prime is 1397651873. The reversal of 1397651856 is 6581567931.

It is a junction number, because it is equal to n+sod(n) for n = 1397651799 and 1397651808.

It is not an unprimeable number, because it can be changed into a prime (1397651851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 481000 + ... + 483896.

It is an arithmetic number, because the mean of its divisors is an integer number (33120276).

Almost surely, 2^1397651856 is an apocalyptic number.

1397651856 is a gapful number since it is divisible by the number (16) 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 1397651856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1987216560).

1397651856 is an abundant number, since it is smaller than the sum of its proper divisors (2576781264).

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

1397651856 is a wasteful number, since it uses less digits than its factorization.

1397651856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973 (or 2944 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 51.

The square root of 1397651856 is about 37385.1823052931. The cubic root of 1397651856 is about 1118.0631533391.

The spelling of 1397651856 in words is "one billion, three hundred ninety-seven million, six hundred fifty-one thousand, eight hundred fifty-six".