3972491 has 4 divisors (see below), whose sum is σ = 4145232. Its totient is φ = 3799752.

The previous prime is 3972467. The next prime is 3972499. The reversal of 3972491 is 1942793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3972491 - 2⁶ = 3972427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86336 + ... + 86381.

It is an arithmetic number, because the mean of its divisors is an integer number (1036308).

Almost surely, 2^3972491 is an apocalyptic number.

3972491 is a deficient number, since it is larger than the sum of its proper divisors (172741).

3972491 is a wasteful number, since it uses less digits than its factorization.

3972491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172740.

The product of its digits is 13608, while the sum is 35.

The square root of 3972491 is about 1993.1108850237. The cubic root of 3972491 is about 158.3753693252.

The spelling of 3972491 in words is "three million, nine hundred seventy-two thousand, four hundred ninety-one".