3972641 has 4 divisors (see below), whose sum is σ = 4065072. Its totient is φ = 3880212.

The previous prime is 3972601. The next prime is 3972643. The reversal of 3972641 is 1462793.

3972641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1462793 = 661 ⋅2213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972641 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3972598 and 3972607.

It is not an unprimeable number, because it can be changed into a prime (3972643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46151 + ... + 46236.

It is an arithmetic number, because the mean of its divisors is an integer number (1016268).

Almost surely, 2^3972641 is an apocalyptic number.

It is an amenable number.

3972641 is a deficient number, since it is larger than the sum of its proper divisors (92431).

3972641 is an equidigital number, since it uses as much as digits as its factorization.

3972641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92430.

The product of its digits is 9072, while the sum is 32.

The square root of 3972641 is about 1993.1485142859. The cubic root of 3972641 is about 158.3773627013.

The spelling of 3972641 in words is "three million, nine hundred seventy-two thousand, six hundred forty-one".