721229338 has 16 divisors (see below), whose sum is σ = 1094131584. Its totient is φ = 356526720.

The previous prime is 721229329. The next prime is 721229363. The reversal of 721229338 is 833922127.

It is a junction number, because it is equal to n+sod(n) for n = 721229297 and 721229306.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361981 + ... + 363967.

It is an arithmetic number, because the mean of its divisors is an integer number (68383224).

Almost surely, 2^721229338 is an apocalyptic number.

721229338 is a deficient number, since it is larger than the sum of its proper divisors (372902246).

721229338 is a wasteful number, since it uses less digits than its factorization.

721229338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957.

The product of its digits is 36288, while the sum is 37.

The square root of 721229338 is about 26855.7133213773. The cubic root of 721229338 is about 896.7907667787.

The spelling of 721229338 in words is "seven hundred twenty-one million, two hundred twenty-nine thousand, three hundred thirty-eight".