3950991 has 32 divisors (see below), whose sum is σ = 6531840. Its totient is φ = 2340000.

The previous prime is 3950951. The next prime is 3951001. The reversal of 3950991 is 1990593.

It is not a de Polignac number, because 3950991 - 2⁶ = 3950927 is a prime.

It is a super-2 number, since 2×3950991² = 31220659764162, which contains 22 as substring.

3950991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3950911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15616 + ... + 15866.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

Almost surely, 2^3950991 is an apocalyptic number.

3950991 is a deficient number, since it is larger than the sum of its proper divisors (2580849).

3950991 is a wasteful number, since it uses less digits than its factorization.

3950991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 3950991 is about 1987.7099889068. The cubic root of 3950991 is about 158.0891314645.

The spelling of 3950991 in words is "three million, nine hundred fifty thousand, nine hundred ninety-one".