18645772 has 6 divisors (see below), whose sum is σ = 32630108. Its totient is φ = 9322884.

The previous prime is 18645763. The next prime is 18645773. The reversal of 18645772 is 27754681.

It is not an unprimeable number, because it can be changed into a prime (18645773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330718 + ... + 2330725.

Almost surely, 2^18645772 is an apocalyptic number.

It is an amenable number.

18645772 is a deficient number, since it is larger than the sum of its proper divisors (13984336).

18645772 is a wasteful number, since it uses less digits than its factorization.

18645772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661447 (or 4661445 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 18645772 is about 4318.0750340864. The cubic root of 18645772 is about 265.1714661040.

The spelling of 18645772 in words is "eighteen million, six hundred forty-five thousand, seven hundred seventy-two".