398503157 has 4 divisors (see below), whose sum is σ = 429157260. Its totient is φ = 367849056.

The previous prime is 398503153. The next prime is 398503159. The reversal of 398503157 is 751305893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 262407601 + 136095556 = 16199^2 + 11666^2 .

It is a cyclic number.

It is not a de Polignac number, because 398503157 - 2² = 398503153 is a prime.

It is a super-2 number, since 2×398503157² = 317609532277933298, 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 (398503153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15327032 + ... + 15327057.

It is an arithmetic number, because the mean of its divisors is an integer number (107289315).

Almost surely, 2^398503157 is an apocalyptic number.

It is an amenable number.

398503157 is a deficient number, since it is larger than the sum of its proper divisors (30654103).

398503157 is a wasteful number, since it uses less digits than its factorization.

398503157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30654102.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 398503157 is about 19962.5438509224. The cubic root of 398503157 is about 735.8860814598.

The spelling of 398503157 in words is "three hundred ninety-eight million, five hundred three thousand, one hundred fifty-seven".