3991346926 has 32 divisors (see below), whose sum is σ = 6876872640. Its totient is φ = 1701962496.

The previous prime is 3991346899. The next prime is 3991346971. The reversal of 3991346926 is 6296431993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3534730 + ... + 3535858.

It is an arithmetic number, because the mean of its divisors is an integer number (214902270).

Almost surely, 2^3991346926 is an apocalyptic number.

3991346926 is a deficient number, since it is larger than the sum of its proper divisors (2885525714).

3991346926 is a wasteful number, since it uses less digits than its factorization.

3991346926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188.

The product of its digits is 1889568, while the sum is 52.

The square root of 3991346926 is about 63177.1076102729. The cubic root of 3991346926 is about 1586.2555673429.

The spelling of 3991346926 in words is "three billion, nine hundred ninety-one million, three hundred forty-six thousand, nine hundred twenty-six".