40140538 has 16 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 19464256.

The previous prime is 40140511. The next prime is 40140539. The reversal of 40140538 is 83504104.

It is a super-2 number, since 2×40140538² = 3222525581858888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40140539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8733 + ... + 12511.

It is an arithmetic number, because the mean of its divisors is an integer number (3878280).

Almost surely, 2^40140538 is an apocalyptic number.

40140538 is a deficient number, since it is larger than the sum of its proper divisors (21911942).

40140538 is a wasteful number, since it uses less digits than its factorization.

40140538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 40140538 is about 6335.6560828378. The cubic root of 40140538 is about 342.3952488368.

The spelling of 40140538 in words is "forty million, one hundred forty thousand, five hundred thirty-eight".