39904951 has 2 divisors, whose sum is σ = 39904952. Its totient is φ = 39904950.

The previous prime is 39904937. The next prime is 39904961. The reversal of 39904951 is 15940993.

It is a strong prime.

It is an emirp because it is prime and its reverse (15940993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39904951 - 2¹¹ = 39902903 is a prime.

It is a super-2 number, since 2×39904951² = 3184810228624802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39904961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19952475 + 19952476.

It is an arithmetic number, because the mean of its divisors is an integer number (19952476).

Almost surely, 2^39904951 is an apocalyptic number.

39904951 is a deficient number, since it is larger than the sum of its proper divisors (1).

39904951 is an equidigital number, since it uses as much as digits as its factorization.

39904951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 39904951 is about 6317.0365678853. The cubic root of 39904951 is about 341.7240886501.

The spelling of 39904951 in words is "thirty-nine million, nine hundred four thousand, nine hundred fifty-one".