397158342025 has 9 divisors (see below), whose sum is σ = 492480251413. Its totient is φ = 317724152800.

The previous prime is 397158342017. The next prime is 397158342041. The reversal of 397158342025 is 520243851793.

The square root of 397158342025 is 630205.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 134444688889 + 262713653136 = 366667^2 + 512556^2 .

It is not a de Polignac number, because 397158342025 - 2³ = 397158342017 is a prime.

It is a super-2 number, since 2×397158342025² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397158342025.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3088005 + ... + 3214045.

Almost surely, 2^397158342025 is an apocalyptic number.

397158342025 is the 630205-th square number.

397158342025 is the 315103-rd centered octagonal number.

It is an amenable number.

397158342025 is a deficient number, since it is larger than the sum of its proper divisors (95321909388).

397158342025 is an frugal number, since it uses more digits than its factorization.

397158342025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252092 (or 126046 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

Multiplying 397158342025 by its sum of digits (49), we get a square (19460758759225 = 4411435²).

The spelling of 397158342025 in words is "three hundred ninety-seven billion, one hundred fifty-eight million, three hundred forty-two thousand, twenty-five".