11938821 has 16 divisors (see below), whose sum is σ = 17149440. Its totient is φ = 7363440.

The previous prime is 11938793. The next prime is 11938853. The reversal of 11938821 is 12883911.

It is not a de Polignac number, because 11938821 - 2⁶ = 11938757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11938891) 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, 16 + ... + 4886.

It is an arithmetic number, because the mean of its divisors is an integer number (1071840).

Almost surely, 2^11938821 is an apocalyptic number.

It is an amenable number.

11938821 is a deficient number, since it is larger than the sum of its proper divisors (5210619).

11938821 is a wasteful number, since it uses less digits than its factorization.

11938821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936.

The product of its digits is 3456, while the sum is 33.

The square root of 11938821 is about 3455.2599033937. The cubic root of 11938821 is about 228.5531161482.

The spelling of 11938821 in words is "eleven million, nine hundred thirty-eight thousand, eight hundred twenty-one".