721939974 has 16 divisors (see below), whose sum is σ = 1650148608. Its totient is φ = 206268552.

The previous prime is 721939973. The next prime is 721939993. The reversal of 721939974 is 479939127.

721939974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721939973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8594482 + ... + 8594565.

It is an arithmetic number, because the mean of its divisors is an integer number (103134288).

Almost surely, 2^721939974 is an apocalyptic number.

721939974 is an abundant number, since it is smaller than the sum of its proper divisors (928208634).

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

721939974 is a wasteful number, since it uses less digits than its factorization.

721939974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17189059.

The product of its digits is 857304, while the sum is 51.

The square root of 721939974 is about 26868.9406936708. The cubic root of 721939974 is about 897.0852096943.

The spelling of 721939974 in words is "seven hundred twenty-one million, nine hundred thirty-nine thousand, nine hundred seventy-four".