40138390 has 16 divisors (see below), whose sum is σ = 72321408. Its totient is φ = 16039296.

The previous prime is 40138387. The next prime is 40138409. The reversal of 40138390 is 9383104.

40138390 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 2×40138390² = 3222180703584200, which contains 22 as substring.

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, 17659 + ... + 19801.

It is an arithmetic number, because the mean of its divisors is an integer number (4520088).

Almost surely, 2^40138390 is an apocalyptic number.

40138390 is a deficient number, since it is larger than the sum of its proper divisors (32183018).

40138390 is a wasteful number, since it uses less digits than its factorization.

40138390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 40138390 is about 6335.4865637929. The cubic root of 40138390 is about 342.3891413110.

It can be divided in two parts, 4013 and 8390, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 40138390 in words is "forty million, one hundred thirty-eight thousand, three hundred ninety".