15827921 has 2 divisors, whose sum is σ = 15827922. Its totient is φ = 15827920.

The previous prime is 15827909. The next prime is 15827957. The reversal of 15827921 is 12972851.

15827921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 1113025 = 3836^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 15827921 - 2¹⁰ = 15826897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15827521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7913960 + 7913961.

It is an arithmetic number, because the mean of its divisors is an integer number (7913961).

Almost surely, 2^15827921 is an apocalyptic number.

It is an amenable number.

15827921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15827921 is an equidigital number, since it uses as much as digits as its factorization.

15827921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 15827921 is about 3978.4319775510. The cubic root of 15827921 is about 251.0775938259.

The spelling of 15827921 in words is "fifteen million, eight hundred twenty-seven thousand, nine hundred twenty-one".