721877349 has 4 divisors (see below), whose sum is σ = 962503136. Its totient is φ = 481251564.

The previous prime is 721877347. The next prime is 721877353. The reversal of 721877349 is 943778127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 721877349 - 2¹ = 721877347 is a prime.

It is a super-2 number, since 2×721877349² = 1042213813998535602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721877298 and 721877307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721877347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120312889 + ... + 120312894.

It is an arithmetic number, because the mean of its divisors is an integer number (240625784).

Almost surely, 2^721877349 is an apocalyptic number.

It is an amenable number.

721877349 is a deficient number, since it is larger than the sum of its proper divisors (240625787).

721877349 is a wasteful number, since it uses less digits than its factorization.

721877349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240625786.

The product of its digits is 592704, while the sum is 48.

The square root of 721877349 is about 26867.7752893685. The cubic root of 721877349 is about 897.0592695941.

The spelling of 721877349 in words is "seven hundred twenty-one million, eight hundred seventy-seven thousand, three hundred forty-nine".