11973918 has 24 divisors (see below), whose sum is σ = 26324424. Its totient is φ = 3628240.

The previous prime is 11973911. The next prime is 11973931. The reversal of 11973918 is 81937911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11973911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7521 + ... + 8972.

It is an arithmetic number, because the mean of its divisors is an integer number (1096851).

Almost surely, 2^11973918 is an apocalyptic number.

11973918 is an abundant number, since it is smaller than the sum of its proper divisors (14350506).

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

11973918 is a wasteful number, since it uses less digits than its factorization.

11973918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16520 (or 16509 counting only the distinct ones).

The product of its digits is 13608, while the sum is 39.

The square root of 11973918 is about 3460.3349548851. The cubic root of 11973918 is about 228.7768590994.

It can be divided in two parts, 1197 and 3918, that added together give a palindrome (5115).

The spelling of 11973918 in words is "eleven million, nine hundred seventy-three thousand, nine hundred eighteen".