721092 has 12 divisors (see below), whose sum is σ = 1682576. Its totient is φ = 240360.

The previous prime is 721087. The next prime is 721109. The reversal of 721092 is 290127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30034 + ... + 30057.

2⁷²¹⁰⁹² is an apocalyptic number.

It is an amenable number.

721092 is an abundant number, since it is smaller than the sum of its proper divisors (961484).

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

721092 is a wasteful number, since it uses less digits than its factorization.

721092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60098 (or 60096 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 721092 is about 849.1713607983. The cubic root of 721092 is about 89.6733840240.

The spelling of 721092 in words is "seven hundred twenty-one thousand, ninety-two".