40138490 has 64 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 13029120.

The previous prime is 40138471. The next prime is 40138529. The reversal of 40138490 is 9483104.

It is a super-2 number, since 2×40138490² = 3222196758960200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114836 + ... + 115184.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^40138490 is an apocalyptic number.

40138490 is an abundant number, since it is smaller than the sum of its proper divisors (46952710).

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

40138490 is a wasteful number, since it uses less digits than its factorization.

40138490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40138490 is about 6335.4944558416. The cubic root of 40138490 is about 342.3894256513.

The spelling of 40138490 in words is "forty million, one hundred thirty-eight thousand, four hundred ninety".