8721370 has 32 divisors (see below), whose sum is σ = 18724608. Its totient is φ = 2859648.

The previous prime is 8721359. The next prime is 8721371. The reversal of 8721370 is 731278.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1099 + ... + 4318.

It is an arithmetic number, because the mean of its divisors is an integer number (585144).

Almost surely, 2^8721370 is an apocalyptic number.

8721370 is an abundant number, since it is smaller than the sum of its proper divisors (10003238).

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

8721370 is a wasteful number, since it uses less digits than its factorization.

8721370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 8721370 is about 2953.1965732067. The cubic root of 8721370 is about 205.8392719943.

The spelling of 8721370 in words is "eight million, seven hundred twenty-one thousand, three hundred seventy".