8721450 has 36 divisors (see below), whose sum is σ = 23432838. Its totient is φ = 2325600.

The previous prime is 8721443. The next prime is 8721467. The reversal of 8721450 is 541278.

It can be written as a sum of positive squares in 3 ways, for example, as 7469289 + 1252161 = 2733^2 + 1119^2 .

It is a super-3 number, since 3×8721450³ (a number of 22 digits) contains 333 as substring.

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

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9241 + ... + 10140.

Almost surely, 2^8721450 is an apocalyptic number.

8721450 is an abundant number, since it is smaller than the sum of its proper divisors (14711388).

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

8721450 is a wasteful number, since it uses less digits than its factorization.

8721450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19399 (or 19391 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 8721450 is about 2953.2101178209. The cubic root of 8721450 is about 205.8399013714.

The spelling of 8721450 in words is "eight million, seven hundred twenty-one thousand, four hundred fifty".