18646228 has 6 divisors (see below), whose sum is σ = 32630906. Its totient is φ = 9323112.

The previous prime is 18646211. The next prime is 18646231. The reversal of 18646228 is 82264681.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 685584 = 4238^2 + 828^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2330775 + ... + 2330782.

Almost surely, 2^18646228 is an apocalyptic number.

It is an amenable number.

18646228 is a deficient number, since it is larger than the sum of its proper divisors (13984678).

18646228 is a wasteful number, since it uses less digits than its factorization.

18646228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661561 (or 4661559 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 18646228 is about 4318.1278350693. The cubic root of 18646228 is about 265.1736277594.

The spelling of 18646228 in words is "eighteen million, six hundred forty-six thousand, two hundred twenty-eight".