11987638 has 32 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 5266080.

The previous prime is 11987629. The next prime is 11987641. The reversal of 11987638 is 83678911.

It is a junction number, because it is equal to n+sod(n) for n = 11987594 and 11987603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86173 + ... + 86311.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^11987638 is an apocalyptic number.

11987638 is a deficient number, since it is larger than the sum of its proper divisors (8333642).

11987638 is a wasteful number, since it uses less digits than its factorization.

11987638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 72576, while the sum is 43.

The square root of 11987638 is about 3462.3168543621. The cubic root of 11987638 is about 228.8642050688.

It can be divided in two parts, 1198 and 7638, that added together give a square (8836 = 94²).

The spelling of 11987638 in words is "eleven million, nine hundred eighty-seven thousand, six hundred thirty-eight".