39917990 has 32 divisors (see below), whose sum is σ = 82361664. Its totient is φ = 13645440.

The previous prime is 39917981. The next prime is 39918059. The reversal of 39917990 is 9971993.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 31652 + ... + 32888.

It is an arithmetic number, because the mean of its divisors is an integer number (2573802).

Almost surely, 2^39917990 is an apocalyptic number.

39917990 is an abundant number, since it is smaller than the sum of its proper divisors (42443674).

39917990 is a wasteful number, since it uses less digits than its factorization.

39917990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 39917990 is about 6318.0685339746. The cubic root of 39917990 is about 341.7613042091.

The spelling of 39917990 in words is "thirty-nine million, nine hundred seventeen thousand, nine hundred ninety".