398724775 has 6 divisors (see below), whose sum is σ = 494418752. Its totient is φ = 318979800.

The previous prime is 398724761. The next prime is 398724787. The reversal of 398724775 is 577427893.

It is not a de Polignac number, because 398724775 - 2⁵ = 398724743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7974471 + ... + 7974520.

Almost surely, 2^398724775 is an apocalyptic number.

398724775 is a deficient number, since it is larger than the sum of its proper divisors (95693977).

398724775 is a wasteful number, since it uses less digits than its factorization.

398724775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15949001 (or 15948996 counting only the distinct ones).

The product of its digits is 2963520, while the sum is 52.

The square root of 398724775 is about 19968.0939250595. The cubic root of 398724775 is about 736.0224713277.

The spelling of 398724775 in words is "three hundred ninety-eight million, seven hundred twenty-four thousand, seven hundred seventy-five".