3972889 has 4 divisors (see below), whose sum is σ = 3977424. Its totient is φ = 3968356.

The previous prime is 3972877. The next prime is 3972901. The reversal of 3972889 is 9882793.

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 a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (3972877) and next prime (3972901).

It is a cyclic number.

It is not a de Polignac number, because 3972889 - 2⁹ = 3972377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3972809) 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, 487 + ... + 2860.

It is an arithmetic number, because the mean of its divisors is an integer number (994356).

Almost surely, 2^3972889 is an apocalyptic number.

It is an amenable number.

3972889 is a deficient number, since it is larger than the sum of its proper divisors (4535).

3972889 is a wasteful number, since it uses less digits than its factorization.

3972889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4534.

The product of its digits is 217728, while the sum is 46.

The square root of 3972889 is about 1993.2107264411. The cubic root of 3972889 is about 158.3806583065.

The spelling of 3972889 in words is "three million, nine hundred seventy-two thousand, eight hundred eighty-nine".