7797989 has 6 divisors (see below), whose sum is σ = 8152326. Its totient is φ = 7458440.

The previous prime is 7797983. The next prime is 7797991. The reversal of 7797989 is 9897977.

It can be written as a sum of positive squares in only one way, i.e., 7745089 + 52900 = 2783^2 + 230^2 .

It is not a de Polignac number, because 7797989 - 2¹² = 7793893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7797983) 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, 6842 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (1358721).

Almost surely, 2^7797989 is an apocalyptic number.

It is an amenable number.

7797989 is a deficient number, since it is larger than the sum of its proper divisors (354337).

7797989 is a wasteful number, since it uses less digits than its factorization.

7797989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14787 (or 14764 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 56.

The square root of 7797989 is about 2792.4879587923. The cubic root of 7797989 is about 198.3022032130.

The spelling of 7797989 in words is "seven million, seven hundred ninety-seven thousand, nine hundred eighty-nine".