398724754 has 16 divisors (see below), whose sum is σ = 613543896. Its totient is φ = 194224000.

The previous prime is 398724751. The next prime is 398724761. The reversal of 398724754 is 457427893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 265853025 + 132871729 = 16305^2 + 11527^2 .

It is a junction number, because it is equal to n+sod(n) for n = 398724698 and 398724707.

It is not an unprimeable number, because it can be changed into a prime (398724751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62304 + ... + 68404.

Almost surely, 2^398724754 is an apocalyptic number.

398724754 is a deficient number, since it is larger than the sum of its proper divisors (214819142).

398724754 is a wasteful number, since it uses less digits than its factorization.

398724754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6941.

The product of its digits is 1693440, while the sum is 49.

The square root of 398724754 is about 19968.0933992207. The cubic root of 398724754 is about 736.0224584061.

The spelling of 398724754 in words is "three hundred ninety-eight million, seven hundred twenty-four thousand, seven hundred fifty-four".