1397215552 has 14 divisors (see below), whose sum is σ = 2772599738. Its totient is φ = 698607744.

The previous prime is 1397215549. The next prime is 1397215583. The reversal of 1397215552 is 2555127931.

It can be written as a sum of positive squares in only one way, i.e., 848906496 + 548309056 = 29136^2 + 23416^2 .

It is a super-2 number, since 2×1397215552² = 3904422597501329408, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 10915683 + ... + 10915810.

Almost surely, 2^1397215552 is an apocalyptic number.

It is an amenable number.

1397215552 is a deficient number, since it is larger than the sum of its proper divisors (1375384186).

1397215552 is an equidigital number, since it uses as much as digits as its factorization.

1397215552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21831505 (or 21831495 counting only the distinct ones).

The product of its digits is 94500, while the sum is 40.

The square root of 1397215552 is about 37379.3465967505. The cubic root of 1397215552 is about 1117.9467995674.

The spelling of 1397215552 in words is "one billion, three hundred ninety-seven million, two hundred fifteen thousand, five hundred fifty-two".