39403990 has 16 divisors (see below), whose sum is σ = 71287200. Its totient is φ = 15681600.

The previous prime is 39403981. The next prime is 39403999. The reversal of 39403990 is 9930493.

It is an interprime number because it is at equal distance from previous prime (39403981) and next prime (39403999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39403999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7911 + ... + 11890.

It is an arithmetic number, because the mean of its divisors is an integer number (4455450).

Almost surely, 2^39403990 is an apocalyptic number.

39403990 is a deficient number, since it is larger than the sum of its proper divisors (31883210).

39403990 is a wasteful number, since it uses less digits than its factorization.

39403990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20007.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 39403990 is about 6277.2597524716. The cubic root of 39403990 is about 340.2880776459.

The spelling of 39403990 in words is "thirty-nine million, four hundred three thousand, nine hundred ninety".