404042724 has 18 divisors (see below), whose sum is σ = 1021330310. Its totient is φ = 134680896.

The previous prime is 404042719. The next prime is 404042767. The reversal of 404042724 is 427240404.

It can be written as a sum of positive squares in only one way, i.e., 392753124 + 11289600 = 19818^2 + 3360^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5611669 + ... + 5611740.

Almost surely, 2^404042724 is an apocalyptic number.

It is an amenable number.

404042724 is an abundant number, since it is smaller than the sum of its proper divisors (617287586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404042724 is a wasteful number, since it uses less digits than its factorization.

404042724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11223419 (or 11223414 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 404042724 is about 20100.8140133677. The cubic root of 404042724 is about 739.2802375726.

It can be divided in two parts, 4040 and 42724, that added together give a palindrome (46764).

The spelling of 404042724 in words is "four hundred four million, forty-two thousand, seven hundred twenty-four".