40391004 has 12 divisors (see below), whose sum is σ = 94245704. Its totient is φ = 13463664.

The previous prime is 40391003. The next prime is 40391053. The reversal of 40391004 is 40019304.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40391003) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1682947 + ... + 1682970.

Almost surely, 2^40391004 is an apocalyptic number.

It is an amenable number.

40391004 is an abundant number, since it is smaller than the sum of its proper divisors (53854700).

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

40391004 is a wasteful number, since it uses less digits than its factorization.

40391004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365924 (or 3365922 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40391004 is about 6355.3917267152. The cubic root of 40391004 is about 343.1059237041.

The spelling of 40391004 in words is "forty million, three hundred ninety-one thousand, four".