18722570 has 16 divisors (see below), whose sum is σ = 33794280. Its totient is φ = 7468224.

The previous prime is 18722569. The next prime is 18722573. The reversal of 18722570 is 7522781.

It can be written as a sum of positive squares in 4 ways, for example, as 14845609 + 3876961 = 3853^2 + 1969^2 .

It is not an unprimeable number, because it can be changed into a prime (18722573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484 + ... + 6296.

Almost surely, 2^18722570 is an apocalyptic number.

18722570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18722570 is a deficient number, since it is larger than the sum of its proper divisors (15071710).

18722570 is a wasteful number, since it uses less digits than its factorization.

18722570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 18722570 is about 4326.9585160942. The cubic root of 18722570 is about 265.5350291831.

The spelling of 18722570 in words is "eighteen million, seven hundred twenty-two thousand, five hundred seventy".