721396106 has 8 divisors (see below), whose sum is σ = 1082276640. Its totient is φ = 360637228.

The previous prime is 721396099. The next prime is 721396111. The reversal of 721396106 is 601693127.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13766 + ... + 40401.

It is an arithmetic number, because the mean of its divisors is an integer number (135284580).

Almost surely, 2^721396106 is an apocalyptic number.

721396106 is a deficient number, since it is larger than the sum of its proper divisors (360880534).

721396106 is a wasteful number, since it uses less digits than its factorization.

721396106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60828.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 721396106 is about 26858.8180305835. The cubic root of 721396106 is about 896.8598823240.

The spelling of 721396106 in words is "seven hundred twenty-one million, three hundred ninety-six thousand, one hundred six".