11977639 has 4 divisors (see below), whose sum is σ = 12682224. Its totient is φ = 11273056.

The previous prime is 11977633. The next prime is 11977681. The reversal of 11977639 is 93677911.

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 11977639 - 2³ = 11977631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11977595 and 11977604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11977631) 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, 352267 + ... + 352300.

It is an arithmetic number, because the mean of its divisors is an integer number (3170556).

Almost surely, 2^11977639 is an apocalyptic number.

11977639 is a deficient number, since it is larger than the sum of its proper divisors (704585).

11977639 is an equidigital number, since it uses as much as digits as its factorization.

11977639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704584.

The product of its digits is 71442, while the sum is 43.

The square root of 11977639 is about 3460.8725778335. The cubic root of 11977639 is about 228.8005547833.

It can be divided in two parts, 1197 and 7639, that added together give a square (8836 = 94²).

The spelling of 11977639 in words is "eleven million, nine hundred seventy-seven thousand, six hundred thirty-nine".