40191904 has 12 divisors (see below), whose sum is σ = 79127874. Its totient is φ = 20095936.

The previous prime is 40191901. The next prime is 40191911. The reversal of 40191904 is 40919104.

It can be written as a sum of positive squares in only one way, i.e., 26501904 + 13690000 = 5148^2 + 3700^2 .

It is not an unprimeable number, because it can be changed into a prime (40191901) 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 as a sum of consecutive naturals, namely, 627967 + ... + 628030.

Almost surely, 2^40191904 is an apocalyptic number.

It is an amenable number.

40191904 is a deficient number, since it is larger than the sum of its proper divisors (38935970).

40191904 is a wasteful number, since it uses less digits than its factorization.

40191904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256007 (or 1255999 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 40191904 is about 6339.7085106494. The cubic root of 40191904 is about 342.5412357335.

The spelling of 40191904 in words is "forty million, one hundred ninety-one thousand, nine hundred four".