11918621 has 12 divisors (see below), whose sum is σ = 14110236. Its totient is φ = 10000320.

The previous prime is 11918617. The next prime is 11918629. The reversal of 11918621 is 12681911.

It can be written as a sum of positive squares in 2 ways, for example, as 662596 + 11256025 = 814^2 + 3355^2 .

It is not a de Polignac number, because 11918621 - 2² = 11918617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11918629) 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, 2216 + ... + 5361.

It is an arithmetic number, because the mean of its divisors is an integer number (1175853).

Almost surely, 2^11918621 is an apocalyptic number.

11918621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11918621 is a deficient number, since it is larger than the sum of its proper divisors (2191615).

11918621 is a wasteful number, since it uses less digits than its factorization.

11918621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7612 (or 7601 counting only the distinct ones).

The product of its digits is 864, while the sum is 29.

The square root of 11918621 is about 3452.3355862372. The cubic root of 11918621 is about 228.4241425197.

The spelling of 11918621 in words is "eleven million, nine hundred eighteen thousand, six hundred twenty-one".