721924013 has 8 divisors (see below), whose sum is σ = 730661568. Its totient is φ = 713219904.

The previous prime is 721924003. The next prime is 721924031. The reversal of 721924013 is 310429127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721924013 - 2²² = 717729709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721924003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36506 + ... + 52692.

It is an arithmetic number, because the mean of its divisors is an integer number (91332696).

Almost surely, 2^721924013 is an apocalyptic number.

It is an amenable number.

721924013 is a deficient number, since it is larger than the sum of its proper divisors (8737555).

721924013 is a wasteful number, since it uses less digits than its factorization.

721924013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16723.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 721924013 is about 26868.6436762260. The cubic root of 721924013 is about 897.0785985803.

The spelling of 721924013 in words is "seven hundred twenty-one million, nine hundred twenty-four thousand, thirteen".