15796721 has 2 divisors, whose sum is σ = 15796722. Its totient is φ = 15796720.

The previous prime is 15796717. The next prime is 15796727. The reversal of 15796721 is 12769751.

15796721 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., 15124321 + 672400 = 3889^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 15796721 - 2² = 15796717 is a prime.

It is not a weakly prime, because it can be changed into another prime (15796727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7898360 + 7898361.

It is an arithmetic number, because the mean of its divisors is an integer number (7898361).

Almost surely, 2^15796721 is an apocalyptic number.

It is an amenable number.

15796721 is a deficient number, since it is larger than the sum of its proper divisors (1).

15796721 is an equidigital number, since it uses as much as digits as its factorization.

15796721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 15796721 is about 3974.5089004807. The cubic root of 15796721 is about 250.9125105787.

The spelling of 15796721 in words is "fifteen million, seven hundred ninety-six thousand, seven hundred twenty-one".