18238628 has 6 divisors (see below), whose sum is σ = 31917606. Its totient is φ = 9119312.

The previous prime is 18238553. The next prime is 18238631. The reversal of 18238628 is 82683281.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 73984 = 4262^2 + 272^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18238591 and 18238600.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2279825 + ... + 2279832.

It is an arithmetic number, because the mean of its divisors is an integer number (5319601).

Almost surely, 2^18238628 is an apocalyptic number.

It is an amenable number.

18238628 is a deficient number, since it is larger than the sum of its proper divisors (13678978).

18238628 is a wasteful number, since it uses less digits than its factorization.

18238628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559661 (or 4559659 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18238628 is about 4270.6706733252. The cubic root of 18238628 is about 263.2271743576.

The spelling of 18238628 in words is "eighteen million, two hundred thirty-eight thousand, six hundred twenty-eight".