3949915651990 has 96 divisors (see below), whose sum is σ = 9414799651584. Its totient is φ = 1177614567360.

The previous prime is 3949915651961. The next prime is 3949915652017. The reversal of 3949915651990 is 991565199493.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15806964 + ... + 16054903.

It is an arithmetic number, because the mean of its divisors is an integer number (98070829704).

Almost surely, 2^{3949915651990} is an apocalyptic number.

3949915651990 is an abundant number, since it is smaller than the sum of its proper divisors (5464883999594).

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

3949915651990 is a wasteful number, since it uses less digits than its factorization.

3949915651990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31861922 (or 31861915 counting only the distinct ones).

The product of its (nonzero) digits is 106288200, while the sum is 70.

The spelling of 3949915651990 in words is "three trillion, nine hundred forty-nine billion, nine hundred fifteen million, six hundred fifty-one thousand, nine hundred ninety".