7663989 has 4 divisors (see below), whose sum is σ = 10218656. Its totient is φ = 5109324.

The previous prime is 7663969. The next prime is 7663993. The reversal of 7663989 is 9893667.

It is a happy number.

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 not a de Polignac number, because 7663989 - 2¹² = 7659893 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 (7663969) 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, 1277329 + ... + 1277334.

It is an arithmetic number, because the mean of its divisors is an integer number (2554664).

Almost surely, 2^7663989 is an apocalyptic number.

It is an amenable number.

7663989 is a deficient number, since it is larger than the sum of its proper divisors (2554667).

7663989 is a wasteful number, since it uses less digits than its factorization.

7663989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554666.

The product of its digits is 489888, while the sum is 48.

The square root of 7663989 is about 2768.3910489669. The cubic root of 7663989 is about 197.1597645805.

The spelling of 7663989 in words is "seven million, six hundred sixty-three thousand, nine hundred eighty-nine".