2638989 has 6 divisors (see below), whose sum is σ = 3811886. Its totient is φ = 1759320.

The previous prime is 2638973. The next prime is 2639041. The reversal of 2638989 is 9898362.

2638989 is a `hidden beast` number, since 2 + 638 + 9 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2528100 + 110889 = 1590^2 + 333^2 .

It is not a de Polignac number, because 2638989 - 2⁴ = 2638973 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 (2638919) 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, 146602 + ... + 146619.

2^2638989 is an apocalyptic number.

It is an amenable number.

2638989 is a deficient number, since it is larger than the sum of its proper divisors (1172897).

2638989 is a wasteful number, since it uses less digits than its factorization.

2638989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293227 (or 293224 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 2638989 is about 1624.4965373924. The cubic root of 2638989 is about 138.1908198277.

The spelling of 2638989 in words is "two million, six hundred thirty-eight thousand, nine hundred eighty-nine".