3972161 has 4 divisors (see below), whose sum is σ = 4009392. Its totient is φ = 3934932.

The previous prime is 3972151. The next prime is 3972167. The reversal of 3972161 is 1612793.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3972161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972167) 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, 18455 + ... + 18668.

It is an arithmetic number, because the mean of its divisors is an integer number (1002348).

Almost surely, 2^3972161 is an apocalyptic number.

It is an amenable number.

3972161 is a deficient number, since it is larger than the sum of its proper divisors (37231).

3972161 is a wasteful number, since it uses less digits than its factorization.

3972161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37230.

The product of its digits is 2268, while the sum is 29.

The square root of 3972161 is about 1993.0280981461. The cubic root of 3972161 is about 158.3709837210.

The spelling of 3972161 in words is "three million, nine hundred seventy-two thousand, one hundred sixty-one".