39904866 has 64 divisors (see below), whose sum is σ = 92067840. Its totient is φ = 12804480.

The previous prime is 39904861. The next prime is 39904871. The reversal of 39904866 is 66840993.

It is an interprime number because it is at equal distance from previous prime (39904861) and next prime (39904871).

It is a super-3 number, since 3×39904866³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39904861) 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 31 ways as a sum of consecutive naturals, for example, 208831 + ... + 209021.

It is an arithmetic number, because the mean of its divisors is an integer number (1438560).

Almost surely, 2^39904866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39904866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46033920).

39904866 is an abundant number, since it is smaller than the sum of its proper divisors (52162974).

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

39904866 is a wasteful number, since it uses less digits than its factorization.

39904866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 39904866 is about 6317.0298400435. The cubic root of 39904866 is about 341.7238460189.

The spelling of 39904866 in words is "thirty-nine million, nine hundred four thousand, eight hundred sixty-six".