18213652 has 6 divisors (see below), whose sum is σ = 31873898. Its totient is φ = 9106824.

The previous prime is 18213617. The next prime is 18213659. The reversal of 18213652 is 25631281.

It can be written as a sum of positive squares in only one way, i.e., 14776336 + 3437316 = 3844^2 + 1854^2 .

It is a super-3 number, since 3×18213652³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18213652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2276703 + ... + 2276710.

Almost surely, 2^18213652 is an apocalyptic number.

It is an amenable number.

18213652 is a deficient number, since it is larger than the sum of its proper divisors (13660246).

18213652 is a wasteful number, since it uses less digits than its factorization.

18213652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553417 (or 4553415 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 18213652 is about 4267.7455406807. The cubic root of 18213652 is about 263.1069649286.

The spelling of 18213652 in words is "eighteen million, two hundred thirteen thousand, six hundred fifty-two".