721897229 has 8 divisors (see below), whose sum is σ = 760662240. Its totient is φ = 683209296.

The previous prime is 721897213. The next prime is 721897283. The reversal of 721897229 is 922798127.

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

It is not a de Polignac number, because 721897229 - 2⁴ = 721897213 is a prime.

It is a super-2 number, since 2×721897229² = 1042271218475756882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721897829) 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, 494 + ... + 38000.

It is an arithmetic number, because the mean of its divisors is an integer number (95082780).

Almost surely, 2^721897229 is an apocalyptic number.

It is an amenable number.

721897229 is a deficient number, since it is larger than the sum of its proper divisors (38765011).

721897229 is a wasteful number, since it uses less digits than its factorization.

721897229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38539.

The product of its digits is 254016, while the sum is 47.

The square root of 721897229 is about 26868.1452467415. The cubic root of 721897229 is about 897.0675043146.

The spelling of 721897229 in words is "seven hundred twenty-one million, eight hundred ninety-seven thousand, two hundred twenty-nine".