40238478 has 32 divisors (see below), whose sum is σ = 102193920. Its totient is φ = 11496600.

The previous prime is 40238461. The next prime is 40238479. The reversal of 40238478 is 87483204.

It is a super-2 number, since 2×40238478² = 3238270223512968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40238479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52848 + ... + 53603.

It is an arithmetic number, because the mean of its divisors is an integer number (3193560).

Almost surely, 2^40238478 is an apocalyptic number.

40238478 is an abundant number, since it is smaller than the sum of its proper divisors (61955442).

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

40238478 is a wasteful number, since it uses less digits than its factorization.

40238478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106469 (or 106463 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 40238478 is about 6343.3806444198. The cubic root of 40238478 is about 342.6734958458.

The spelling of 40238478 in words is "forty million, two hundred thirty-eight thousand, four hundred seventy-eight".