721698342 has 8 divisors (see below), whose sum is σ = 1443396696. Its totient is φ = 240566112.

The previous prime is 721698319. The next prime is 721698377. The reversal of 721698342 is 243896127.

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

721698342 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 721698294 and 721698303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60141523 + ... + 60141534.

It is an arithmetic number, because the mean of its divisors is an integer number (180424587).

Almost surely, 2^721698342 is an apocalyptic number.

721698342 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721698342 is a wasteful number, since it uses less digits than its factorization.

721698342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120283062.

The product of its digits is 145152, while the sum is 42.

The square root of 721698342 is about 26864.4438245053. The cubic root of 721698342 is about 896.9851142620.

The spelling of 721698342 in words is "seven hundred twenty-one million, six hundred ninety-eight thousand, three hundred forty-two".