2638399 has 4 divisors (see below), whose sum is σ = 2753136. Its totient is φ = 2523664.

The previous prime is 2638381. The next prime is 2638403. The reversal of 2638399 is 9938362.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2638399 - 2⁵ = 2638367 is a prime.

It is a super-2 number, since 2×2638399² = 13922298566402, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638319) 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, 57334 + ... + 57379.

It is an arithmetic number, because the mean of its divisors is an integer number (688284).

2^2638399 is an apocalyptic number.

2638399 is a deficient number, since it is larger than the sum of its proper divisors (114737).

2638399 is a wasteful number, since it uses less digits than its factorization.

2638399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114736.

The product of its digits is 69984, while the sum is 40.

The square root of 2638399 is about 1624.3149325177. The cubic root of 2638399 is about 138.1805205982.

It can be divided in two parts, 2 and 638399, that added together give a square (638401 = 799²).

The spelling of 2638399 in words is "two million, six hundred thirty-eight thousand, three hundred ninety-nine".