40142538 has 24 divisors (see below), whose sum is σ = 88452000. Its totient is φ = 13153704.

The previous prime is 40142533. The next prime is 40142549. The reversal of 40142538 is 83524104.

40142538 is a `hidden beast` number, since 401 + 4 + 253 + 8 = 666.

It is a super-2 number, since 2×40142538² = 3222846714162888, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40142533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17838 + ... + 19961.

It is an arithmetic number, because the mean of its divisors is an integer number (3685500).

Almost surely, 2^40142538 is an apocalyptic number.

40142538 is an abundant number, since it is smaller than the sum of its proper divisors (48309462).

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

40142538 is a wasteful number, since it uses less digits than its factorization.

40142538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37866 (or 37863 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 40142538 is about 6335.8139177220. The cubic root of 40142538 is about 342.4009353502.

The spelling of 40142538 in words is "forty million, one hundred forty-two thousand, five hundred thirty-eight".