1397890032 has 240 divisors, whose sum is σ = 4653345024. Its totient is φ = 357504000.

The previous prime is 1397890031. The next prime is 1397890061. The reversal of 1397890032 is 2300987931.

It is a super-2 number, since 2×1397890032² = 3908193083129922048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397890031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1836532 + ... + 1837292.

Almost surely, 2^1397890032 is an apocalyptic number.

1397890032 is a gapful number since it is divisible by the number (12) 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 1397890032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2326672512).

1397890032 is an abundant number, since it is smaller than the sum of its proper divisors (3255454992).

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

1397890032 is a wasteful number, since it uses less digits than its factorization.

1397890032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 1397890032 is about 37388.3676027719. The cubic root of 1397890032 is about 1118.1266600184.

The spelling of 1397890032 in words is "one billion, three hundred ninety-seven million, eight hundred ninety thousand, thirty-two".