18628905 has 8 divisors (see below), whose sum is σ = 29806272. Its totient is φ = 9935408.

The previous prime is 18628903. The next prime is 18628931. The reversal of 18628905 is 50982681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18628905 - 2¹ = 18628903 is a prime.

It is a super-2 number, since 2×18628905² = 694072202998050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18628901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620949 + ... + 620978.

It is an arithmetic number, because the mean of its divisors is an integer number (3725784).

Almost surely, 2^18628905 is an apocalyptic number.

18628905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18628905 is a deficient number, since it is larger than the sum of its proper divisors (11177367).

18628905 is a wasteful number, since it uses less digits than its factorization.

18628905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241935.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 18628905 is about 4316.1215228490. The cubic root of 18628905 is about 265.0914837814.

The spelling of 18628905 in words is "eighteen million, six hundred twenty-eight thousand, nine hundred five".