721145829 has 8 divisors (see below), whose sum is σ = 967086432. Its totient is φ = 477984560.

The previous prime is 721145827. The next prime is 721145837. The reversal of 721145829 is 928541127.

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 721145829 - 2¹ = 721145827 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721145827) 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, 694227 + ... + 695264.

It is an arithmetic number, because the mean of its divisors is an integer number (120885804).

Almost surely, 2^721145829 is an apocalyptic number.

It is an amenable number.

721145829 is a deficient number, since it is larger than the sum of its proper divisors (245940603).

721145829 is a wasteful number, since it uses less digits than its factorization.

721145829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389667.

The product of its digits is 40320, while the sum is 39.

The square root of 721145829 is about 26854.1585047828. The cubic root of 721145829 is about 896.7561531975.

The spelling of 721145829 in words is "seven hundred twenty-one million, one hundred forty-five thousand, eight hundred twenty-nine".