40904387 has 2 divisors, whose sum is σ = 40904388. Its totient is φ = 40904386.

The previous prime is 40904273. The next prime is 40904399. The reversal of 40904387 is 78340904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40904387 - 2¹⁶ = 40838851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40907387) 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, 20452193 + 20452194.

It is an arithmetic number, because the mean of its divisors is an integer number (20452194).

Almost surely, 2^40904387 is an apocalyptic number.

40904387 is a deficient number, since it is larger than the sum of its proper divisors (1).

40904387 is an equidigital number, since it uses as much as digits as its factorization.

40904387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40904387 is about 6395.6537586083. The cubic root of 40904387 is about 344.5534711824.

The spelling of 40904387 in words is "forty million, nine hundred four thousand, three hundred eighty-seven".