721735922 has 8 divisors (see below), whose sum is σ = 1083726336. Its totient is φ = 360493812.

The previous prime is 721735921. The next prime is 721735933. The reversal of 721735922 is 229537127.

It is a happy number.

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

It is a super-2 number, since 2×721735922² = 1041805482210380168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721735921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184658 + ... + 188525.

It is an arithmetic number, because the mean of its divisors is an integer number (135465792).

Almost surely, 2^721735922 is an apocalyptic number.

721735922 is a deficient number, since it is larger than the sum of its proper divisors (361990414).

721735922 is a wasteful number, since it uses less digits than its factorization.

721735922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374152.

The product of its digits is 52920, while the sum is 38.

The square root of 721735922 is about 26865.1432529216. The cubic root of 721735922 is about 897.0006831470. Note that the first 3 decimals are identical.

The spelling of 721735922 in words is "seven hundred twenty-one million, seven hundred thirty-five thousand, nine hundred twenty-two".