721622123 has 8 divisors (see below), whose sum is σ = 745844736. Its totient is φ = 697458600.

The previous prime is 721622107. The next prime is 721622177. The reversal of 721622123 is 321226127.

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

It is a cyclic number.

It is not a de Polignac number, because 721622123 - 2⁴ = 721622107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721622092 and 721622101.

It is not an unprimeable number, because it can be changed into a prime (721622023) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10790 + ... + 39492.

It is an arithmetic number, because the mean of its divisors is an integer number (93230592).

Almost surely, 2^721622123 is an apocalyptic number.

721622123 is a deficient number, since it is larger than the sum of its proper divisors (24222613).

721622123 is a wasteful number, since it uses less digits than its factorization.

721622123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29545.

The product of its digits is 2016, while the sum is 26.

The square root of 721622123 is about 26863.0252019388. The cubic root of 721622123 is about 896.9535361028.

The spelling of 721622123 in words is "seven hundred twenty-one million, six hundred twenty-two thousand, one hundred twenty-three".