398131525 has 24 divisors (see below), whose sum is σ = 551714688. Its totient is φ = 282480000.

The previous prime is 398131523. The next prime is 398131571. The reversal of 398131525 is 525131893.

It is a happy number.

It is not a de Polignac number, because 398131525 - 2¹ = 398131523 is a prime.

It is a super-2 number, since 2×398131525² = 317017422397651250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398131523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6381 + ... + 28930.

It is an arithmetic number, because the mean of its divisors is an integer number (22988112).

Almost surely, 2^398131525 is an apocalyptic number.

It is an amenable number.

398131525 is a deficient number, since it is larger than the sum of its proper divisors (153583163).

398131525 is a wasteful number, since it uses less digits than its factorization.

398131525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35373 (or 35368 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 398131525 is about 19953.2334472386. The cubic root of 398131525 is about 735.6572552734.

The spelling of 398131525 in words is "three hundred ninety-eight million, one hundred thirty-one thousand, five hundred twenty-five".