721885341 has 16 divisors (see below), whose sum is σ = 971006400. Its totient is φ = 477028608.

The previous prime is 721885321. The next prime is 721885343. The reversal of 721885341 is 143588127.

It is not a de Polignac number, because 721885341 - 2²¹ = 719788189 is a prime.

It is a super-2 number, since 2×721885341² = 1042236891101372562, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 721885341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721885343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178975 + ... + 182963.

It is an arithmetic number, because the mean of its divisors is an integer number (60687900).

Almost surely, 2^721885341 is an apocalyptic number.

It is an amenable number.

721885341 is a deficient number, since it is larger than the sum of its proper divisors (249121059).

721885341 is a wasteful number, since it uses less digits than its factorization.

721885341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508.

The product of its digits is 53760, while the sum is 39.

The square root of 721885341 is about 26867.9240173111. The cubic root of 721885341 is about 897.0625800694.

The spelling of 721885341 in words is "seven hundred twenty-one million, eight hundred eighty-five thousand, three hundred forty-one".