11638487 has 4 divisors (see below), whose sum is σ = 13301136. Its totient is φ = 9975840.

The previous prime is 11638439. The next prime is 11638493. The reversal of 11638487 is 78483611.

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

It is not a de Polignac number, because 11638487 - 2¹⁰ = 11637463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11638487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11638427) 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, 831314 + ... + 831327.

It is an arithmetic number, because the mean of its divisors is an integer number (3325284).

Almost surely, 2^11638487 is an apocalyptic number.

11638487 is a deficient number, since it is larger than the sum of its proper divisors (1662649).

11638487 is an equidigital number, since it uses as much as digits as its factorization.

11638487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662648.

The product of its digits is 32256, while the sum is 38.

The square root of 11638487 is about 3411.5226805636. The cubic root of 11638487 is about 226.6203165992.

The spelling of 11638487 in words is "eleven million, six hundred thirty-eight thousand, four hundred eighty-seven".