18701072 has 20 divisors (see below), whose sum is σ = 39020940. Its totient is φ = 8631168.

The previous prime is 18701041. The next prime is 18701083. The reversal of 18701072 is 27010781.

It can be written as a sum of positive squares in 2 ways, for example, as 2572816 + 16128256 = 1604^2 + 4016^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 44747 + ... + 45162.

It is an arithmetic number, because the mean of its divisors is an integer number (1951047).

Almost surely, 2^18701072 is an apocalyptic number.

It is an amenable number.

18701072 is an abundant number, since it is smaller than the sum of its proper divisors (20319868).

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

18701072 is a wasteful number, since it uses less digits than its factorization.

18701072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89930 (or 89924 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 18701072 is about 4324.4736095853. The cubic root of 18701072 is about 265.4333576293.

The spelling of 18701072 in words is "eighteen million, seven hundred one thousand, seventy-two".