113638639 has 4 divisors (see below), whose sum is σ = 119619640. Its totient is φ = 107657640.

The previous prime is 113638631. The next prime is 113638649. The reversal of 113638639 is 936836311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936836311 = 1483 ⋅631717.

It is a cyclic number.

It is not a de Polignac number, because 113638639 - 2³ = 113638631 is a prime.

It is a super-3 number, since 3×113638639³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113638631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2990472 + ... + 2990509.

It is an arithmetic number, because the mean of its divisors is an integer number (29904910).

Almost surely, 2^113638639 is an apocalyptic number.

113638639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

113638639 is a deficient number, since it is larger than the sum of its proper divisors (5981001).

113638639 is an equidigital number, since it uses as much as digits as its factorization.

113638639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5981000.

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

The square root of 113638639 is about 10660.1425412609. The cubic root of 113638639 is about 484.3678858976.

It can be divided in two parts, 11363 and 8639, that added together give a palindrome (20002).

The spelling of 113638639 in words is "one hundred thirteen million, six hundred thirty-eight thousand, six hundred thirty-nine".