353864721 has 96 divisors (see below), whose sum is σ = 615198720. Its totient is φ = 179625600.

The previous prime is 353864717. The next prime is 353864723. The reversal of 353864721 is 127468353.

It is not a de Polignac number, because 353864721 - 2² = 353864717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 353864721.

It is not an unprimeable number, because it can be changed into a prime (353864723) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5281530 + ... + 5281596.

It is an arithmetic number, because the mean of its divisors is an integer number (6408320).

Almost surely, 2^353864721 is an apocalyptic number.

353864721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

353864721 is a deficient number, since it is larger than the sum of its proper divisors (261333999).

353864721 is a wasteful number, since it uses less digits than its factorization.

353864721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 188 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 353864721 is about 18811.2923798446. The cubic root of 353864721 is about 707.3142738986.

The spelling of 353864721 in words is "three hundred fifty-three million, eight hundred sixty-four thousand, seven hundred twenty-one".