721974 has 16 divisors (see below), whose sum is σ = 1575360. Its totient is φ = 218760.

The previous prime is 721961. The next prime is 721979. The reversal of 721974 is 479127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721979) by changing a digit.

721974 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5404 + ... + 5535.

It is an arithmetic number, because the mean of its divisors is an integer number (98460).

2⁷²¹⁹⁷⁴ is an apocalyptic number.

721974 is an abundant number, since it is smaller than the sum of its proper divisors (853386).

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

721974 is a wasteful number, since it uses less digits than its factorization.

721974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10955.

The product of its digits is 3528, while the sum is 30.

The square root of 721974 is about 849.6905318997. The cubic root of 721974 is about 89.7099303083.

The spelling of 721974 in words is "seven hundred twenty-one thousand, nine hundred seventy-four".