40139988 has 24 divisors (see below), whose sum is σ = 107040192. Its totient is φ = 11468544.

The previous prime is 40139977. The next prime is 40139993. The reversal of 40139988 is 88993104.

40139988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40139988² = 3222437273280288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 238845 + ... + 239012.

It is an arithmetic number, because the mean of its divisors is an integer number (4460008).

Almost surely, 2^40139988 is an apocalyptic number.

It is an amenable number.

40139988 is an abundant number, since it is smaller than the sum of its proper divisors (66900204).

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

40139988 is a wasteful number, since it uses less digits than its factorization.

40139988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477871 (or 477869 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 40139988 is about 6335.6126775553. The cubic root of 40139988 is about 342.3936850125.

The spelling of 40139988 in words is "forty million, one hundred thirty-nine thousand, nine hundred eighty-eight".