18102772 has 6 divisors (see below), whose sum is σ = 31679858. Its totient is φ = 9051384.

The previous prime is 18102767. The next prime is 18102779. The reversal of 18102772 is 27720181.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 763876 = 4164^2 + 874^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18102772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18102779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2262843 + ... + 2262850.

Almost surely, 2^18102772 is an apocalyptic number.

It is an amenable number.

18102772 is a deficient number, since it is larger than the sum of its proper divisors (13577086).

18102772 is a wasteful number, since it uses less digits than its factorization.

18102772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4525697 (or 4525695 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 18102772 is about 4254.7352444071. The cubic root of 18102772 is about 262.5719687777.

The spelling of 18102772 in words is "eighteen million, one hundred two thousand, seven hundred seventy-two".