721974446 has 16 divisors (see below), whose sum is σ = 1102363776. Its totient is φ = 354551736.

The previous prime is 721974437. The next prime is 721974481. The reversal of 721974446 is 644479127.

It is a junction number, because it is equal to n+sod(n) for n = 721974397 and 721974406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38735 + ... + 54261.

It is an arithmetic number, because the mean of its divisors is an integer number (68897736).

Almost surely, 2^721974446 is an apocalyptic number.

721974446 is a deficient number, since it is larger than the sum of its proper divisors (380389330).

721974446 is a wasteful number, since it uses less digits than its factorization.

721974446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15943.

The product of its digits is 338688, while the sum is 44.

The square root of 721974446 is about 26869.5821701790. The cubic root of 721974446 is about 897.0994878108.

The spelling of 721974446 in words is "seven hundred twenty-one million, nine hundred seventy-four thousand, four hundred forty-six".