11977878 has 32 divisors (see below), whose sum is σ = 26357760. Its totient is φ = 3598560.

The previous prime is 11977859. The next prime is 11977879. The reversal of 11977878 is 87877911.

11977878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11977878² = 286939122765768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11977879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7668 + ... + 9096.

It is an arithmetic number, because the mean of its divisors is an integer number (823680).

Almost surely, 2^11977878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11977878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13178880).

11977878 is an abundant number, since it is smaller than the sum of its proper divisors (14379882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11977878 is a wasteful number, since it uses less digits than its factorization.

11977878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its digits is 197568, while the sum is 48.

The square root of 11977878 is about 3460.9071065257. The cubic root of 11977878 is about 228.8020765904.

The spelling of 11977878 in words is "eleven million, nine hundred seventy-seven thousand, eight hundred seventy-eight".