7972389 has 6 divisors (see below), whose sum is σ = 11515686. Its totient is φ = 5314920.

The previous prime is 7972387. The next prime is 7972411. The reversal of 7972389 is 9832797.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 3932289 = 2010^2 + 1983^2 .

It is not a de Polignac number, because 7972389 - 2¹ = 7972387 is a prime.

It is a d-powerful number, because it can be written as 7² + 9⁶ + 7⁵ + 2¹⁹ + 3⁹ + 8⁷ + 9⁷ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 442902 + ... + 442919.

It is an arithmetic number, because the mean of its divisors is an integer number (1919281).

Almost surely, 2^7972389 is an apocalyptic number.

It is an amenable number.

7972389 is a deficient number, since it is larger than the sum of its proper divisors (3543297).

7972389 is a wasteful number, since it uses less digits than its factorization.

7972389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885827 (or 885824 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 7972389 is about 2823.5419246046. The cubic root of 7972389 is about 199.7696431137.

Subtracting from 7972389 its product of digits (190512), we obtain a palindrome (7781877).

The spelling of 7972389 in words is "seven million, nine hundred seventy-two thousand, three hundred eighty-nine".