40091004 has 24 divisors (see below), whose sum is σ = 103939920. Its totient is φ = 13363632.

The previous prime is 40091003. The next prime is 40091027. The reversal of 40091004 is 40019004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40091003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185499 + ... + 185714.

It is an arithmetic number, because the mean of its divisors is an integer number (4330830).

Almost surely, 2^40091004 is an apocalyptic number.

It is an amenable number.

40091004 is an abundant number, since it is smaller than the sum of its proper divisors (63848916).

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

40091004 is a wasteful number, since it uses less digits than its factorization.

40091004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371226 (or 371218 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 40091004 is about 6331.7457308392. The cubic root of 40091004 is about 342.2543506470.

The spelling of 40091004 in words is "forty million, ninety-one thousand, four".