18228535 has 32 divisors (see below), whose sum is σ = 25038720. Its totient is φ = 12638208.

The previous prime is 18228533. The next prime is 18228541. The reversal of 18228535 is 53582281.

It is a cyclic number.

It is not a de Polignac number, because 18228535 - 2¹ = 18228533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18228535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132987 + ... + 133123.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 2^18228535 is an apocalyptic number.

18228535 is a deficient number, since it is larger than the sum of its proper divisors (6810185).

18228535 is a wasteful number, since it uses less digits than its factorization.

18228535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its digits is 19200, while the sum is 34.

The square root of 18228535 is about 4269.4888452835. The cubic root of 18228535 is about 263.1786099939.

The spelling of 18228535 in words is "eighteen million, two hundred twenty-eight thousand, five hundred thirty-five".