721349398 has 32 divisors (see below), whose sum is σ = 1374485760. Its totient is φ = 275739360.

The previous prime is 721349371. The next prime is 721349401. The reversal of 721349398 is 893943127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36028 + ... + 52351.

It is an arithmetic number, because the mean of its divisors is an integer number (42952680).

Almost surely, 2^721349398 is an apocalyptic number.

721349398 is a deficient number, since it is larger than the sum of its proper divisors (653136362).

721349398 is a wasteful number, since it uses less digits than its factorization.

721349398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88452.

The product of its digits is 326592, while the sum is 46.

The square root of 721349398 is about 26857.9485069132. The cubic root of 721349398 is about 896.8405256741.

The spelling of 721349398 in words is "seven hundred twenty-one million, three hundred forty-nine thousand, three hundred ninety-eight".