7644989 has 4 divisors (see below), whose sum is σ = 8340000. Its totient is φ = 6949980.

The previous prime is 7644961. The next prime is 7644991. The reversal of 7644989 is 9894467.

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-7644989 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 (7644919) 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, 347489 + ... + 347510.

It is an arithmetic number, because the mean of its divisors is an integer number (2085000).

Almost surely, 2^7644989 is an apocalyptic number.

It is an amenable number.

7644989 is a deficient number, since it is larger than the sum of its proper divisors (695011).

7644989 is a wasteful number, since it uses less digits than its factorization.

7644989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695010.

The product of its digits is 435456, while the sum is 47.

The square root of 7644989 is about 2764.9573233596. The cubic root of 7644989 is about 196.9967017408.

The spelling of 7644989 in words is "seven million, six hundred forty-four thousand, nine hundred eighty-nine".