40099988 has 24 divisors (see below), whose sum is σ = 72731904. Its totient is φ = 19324800.

The previous prime is 40099987. The next prime is 40100003. The reversal of 40099988 is 88999004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40099981) 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 7 ways as a sum of consecutive naturals, for example, 40556 + ... + 41532.

It is an arithmetic number, because the mean of its divisors is an integer number (3030496).

Almost surely, 2^40099988 is an apocalyptic number.

It is an amenable number.

40099988 is a deficient number, since it is larger than the sum of its proper divisors (32631916).

40099988 is a wasteful number, since it uses less digits than its factorization.

40099988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 40099988 is about 6332.4551320953. The cubic root of 40099988 is about 342.2799140165.

The spelling of 40099988 in words is "forty million, ninety-nine thousand, nine hundred eighty-eight".