11921418 has 20 divisors (see below), whose sum is σ = 26713170. Its totient is φ = 3973752.

The previous prime is 11921401. The next prime is 11921423. The reversal of 11921418 is 81412911.

It can be written as a sum of positive squares in only one way, i.e., 8450649 + 3470769 = 2907^2 + 1863^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 11921391 and 11921400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36633 + ... + 36956.

Almost surely, 2^11921418 is an apocalyptic number.

11921418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11921418 is an abundant number, since it is smaller than the sum of its proper divisors (14791752).

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

11921418 is an equidigital number, since it uses as much as digits as its factorization.

11921418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73603 (or 73594 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 11921418 is about 3452.7406505557. The cubic root of 11921418 is about 228.4420095855.

The spelling of 11921418 in words is "eleven million, nine hundred twenty-one thousand, four hundred eighteen".