40038990 has 16 divisors (see below), whose sum is σ = 96093648. Its totient is φ = 10677056.

The previous prime is 40038989. The next prime is 40038991. The reversal of 40038990 is 9983004.

40038990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40038989) and next prime (40038991).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40038991) by changing a digit.

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, 667287 + ... + 667346.

It is an arithmetic number, because the mean of its divisors is an integer number (6005853).

Almost surely, 2^40038990 is an apocalyptic number.

40038990 is an abundant number, since it is smaller than the sum of its proper divisors (56054658).

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

40038990 is a wasteful number, since it uses less digits than its factorization.

40038990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334643.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 40038990 is about 6327.6369997022. The cubic root of 40038990 is about 342.1062731871.

The spelling of 40038990 in words is "forty million, thirty-eight thousand, nine hundred ninety".