3972939 has 4 divisors (see below), whose sum is σ = 5297256. Its totient is φ = 2648624.

The previous prime is 3972937. The next prime is 3972953. The reversal of 3972939 is 9392793.

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 3972939 - 2¹ = 3972937 is a prime.

It is an Ulam number.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3972939.

It is not an unprimeable number, because it can be changed into a prime (3972931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662154 + ... + 662159.

It is an arithmetic number, because the mean of its divisors is an integer number (1324314).

Almost surely, 2^3972939 is an apocalyptic number.

3972939 is a deficient number, since it is larger than the sum of its proper divisors (1324317).

3972939 is a wasteful number, since it uses less digits than its factorization.

3972939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324316.

The product of its digits is 91854, while the sum is 42.

The square root of 3972939 is about 1993.2232689792. The cubic root of 3972939 is about 158.3813227264.

The spelling of 3972939 in words is "three million, nine hundred seventy-two thousand, nine hundred thirty-nine".