40138624 has 16 divisors (see below), whose sum is σ = 79963920. Its totient is φ = 20069248.

The previous prime is 40138607. The next prime is 40138661. The reversal of 40138624 is 42683104.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×40138624² = 3222218273226752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40138592 and 40138601.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 156664 + ... + 156919.

It is an arithmetic number, because the mean of its divisors is an integer number (4997745).

Almost surely, 2^40138624 is an apocalyptic number.

It is an amenable number.

40138624 is a deficient number, since it is larger than the sum of its proper divisors (39825296).

40138624 is an equidigital number, since it uses as much as digits as its factorization.

40138624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313597 (or 313585 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 40138624 is about 6335.5050311715. The cubic root of 40138624 is about 342.3898066666.

The spelling of 40138624 in words is "forty million, one hundred thirty-eight thousand, six hundred twenty-four".