721929 has 16 divisors (see below), whose sum is σ = 1052352. Its totient is φ = 437568.

The previous prime is 721921. The next prime is 721951. The reversal of 721929 is 929127.

It is not a de Polignac number, because 721929 - 2³ = 721921 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721896 and 721905.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721929.

It is not an unprimeable number, because it can be changed into a prime (721921) 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, 4087 + ... + 4259.

It is an arithmetic number, because the mean of its divisors is an integer number (65772).

2⁷²¹⁹²⁹ is an apocalyptic number.

It is an amenable number.

721929 is a deficient number, since it is larger than the sum of its proper divisors (330423).

721929 is a wasteful number, since it uses less digits than its factorization.

721929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 2268, while the sum is 30.

The square root of 721929 is about 849.6640512579. The cubic root of 721929 is about 89.7080664227.

The spelling of 721929 in words is "seven hundred twenty-one thousand, nine hundred twenty-nine".