93912721 has 16 divisors (see below), whose sum is σ = 110499840. Its totient is φ = 78146640.

The previous prime is 93912713. The next prime is 93912737. The reversal of 93912721 is 12721939.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 93912721 - 2³ = 93912713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93912521) 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, 42010 + ... + 44188.

It is an arithmetic number, because the mean of its divisors is an integer number (6906240).

Almost surely, 2^93912721 is an apocalyptic number.

It is an amenable number.

93912721 is a deficient number, since it is larger than the sum of its proper divisors (16587119).

93912721 is a wasteful number, since it uses less digits than its factorization.

93912721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its digits is 6804, while the sum is 34.

The square root of 93912721 is about 9690.8575987887. The cubic root of 93912721 is about 454.5428262284.

The spelling of 93912721 in words is "ninety-three million, nine hundred twelve thousand, seven hundred twenty-one".