2638901389 has 16 divisors (see below), whose sum is σ = 2776780800. Its totient is φ = 2503044720.

The previous prime is 2638901359. The next prime is 2638901401. The reversal of 2638901389 is 9831098362.

It is a cyclic number.

It is not a de Polignac number, because 2638901389 - 2¹⁵ = 2638868621 is a prime.

It is a super-2 number, since 2×2638901389² = 13927601081732258642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638901359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1678974 + ... + 1680544.

It is an arithmetic number, because the mean of its divisors is an integer number (173548800).

Almost surely, 2^2638901389 is an apocalyptic number.

It is an amenable number.

2638901389 is a deficient number, since it is larger than the sum of its proper divisors (137879411).

2638901389 is a wasteful number, since it uses less digits than its factorization.

2638901389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 2638901389 is about 51370.2383584114. The cubic root of 2638901389 is about 1381.8929055903.

The spelling of 2638901389 in words is "two billion, six hundred thirty-eight million, nine hundred one thousand, three hundred eighty-nine".