1397025812 has 48 divisors (see below), whose sum is σ = 3037184640. Its totient is φ = 547489152.

The previous prime is 1397025811. The next prime is 1397025823. The reversal of 1397025812 is 2185207931.

It is a super-2 number, since 2×1397025812² = 3903362238788518688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397025811) 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 15 ways as a sum of consecutive naturals, for example, 21014 + ... + 56882.

It is an arithmetic number, because the mean of its divisors is an integer number (63274680).

Almost surely, 2^1397025812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397025812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518592320).

1397025812 is an abundant number, since it is smaller than the sum of its proper divisors (1640158828).

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

1397025812 is a wasteful number, since it uses less digits than its factorization.

1397025812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36000 (or 35998 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1397025812 is about 37376.8084779854. The cubic root of 1397025812 is about 1117.8961920506.

The spelling of 1397025812 in words is "one billion, three hundred ninety-seven million, twenty-five thousand, eight hundred twelve".