11938621 has 4 divisors (see below), whose sum is σ = 12163932. Its totient is φ = 11713312.

The previous prime is 11938603. The next prime is 11938643. The reversal of 11938621 is 12683911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12683911 = 113 ⋅112247.

It can be written as a sum of positive squares in 2 ways, for example, as 4020025 + 7918596 = 2005^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 11938621 - 2⁹ = 11938109 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11938681) 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, 112576 + ... + 112681.

It is an arithmetic number, because the mean of its divisors is an integer number (3040983).

Almost surely, 2^11938621 is an apocalyptic number.

It is an amenable number.

11938621 is a deficient number, since it is larger than the sum of its proper divisors (225311).

11938621 is an equidigital number, since it uses as much as digits as its factorization.

11938621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225310.

The product of its digits is 2592, while the sum is 31.

The square root of 11938621 is about 3455.2309618895. The cubic root of 11938621 is about 228.5518398950.

The spelling of 11938621 in words is "eleven million, nine hundred thirty-eight thousand, six hundred twenty-one".