40404252 has 24 divisors (see below), whose sum is σ = 107744896. Its totient is φ = 11544048.

The previous prime is 40404239. The next prime is 40404269. The reversal of 40404252 is 25240404.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240418 + ... + 240585.

Almost surely, 2^40404252 is an apocalyptic number.

40404252 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

40404252 is an abundant number, since it is smaller than the sum of its proper divisors (67340644).

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

40404252 is a wasteful number, since it uses less digits than its factorization.

40404252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481017 (or 481015 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 40404252 is about 6356.4339058941. The cubic root of 40404252 is about 343.1434318120.

Adding to 40404252 its reverse (25240404), we get a palindrome (65644656).

The spelling of 40404252 in words is "forty million, four hundred four thousand, two hundred fifty-two".