397397525 has 72 divisors (see below), whose sum is σ = 620585280. Its totient is φ = 246412800.

The previous prime is 397397503. The next prime is 397397531. The reversal of 397397525 is 525793793.

It is not a de Polignac number, because 397397525 - 2¹⁴ = 397381141 is a prime.

It is a super-4 number, since 4×397397525⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2858906 + ... + 2859044.

It is an arithmetic number, because the mean of its divisors is an integer number (8619240).

Almost surely, 2^397397525 is an apocalyptic number.

397397525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

397397525 is a deficient number, since it is larger than the sum of its proper divisors (223187755).

397397525 is a wasteful number, since it uses less digits than its factorization.

397397525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 199 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 50.

The square root of 397397525 is about 19934.8319531417. The cubic root of 397397525 is about 735.2048883503.

The spelling of 397397525 in words is "three hundred ninety-seven million, three hundred ninety-seven thousand, five hundred twenty-five".