18189402 has 32 divisors (see below), whose sum is σ = 45356544. Its totient is φ = 4724400.

The previous prime is 18189397. The next prime is 18189421. The reversal of 18189402 is 20498181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19224 + ... + 20147.

It is an arithmetic number, because the mean of its divisors is an integer number (1417392).

Almost surely, 2^18189402 is an apocalyptic number.

18189402 is an abundant number, since it is smaller than the sum of its proper divisors (27167142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18189402 is a wasteful number, since it uses less digits than its factorization.

18189402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39394.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18189402 is about 4264.9035159075. The cubic root of 18189402 is about 262.9901445415.

It can be divided in two parts, 18 and 189402, that added together give a triangular number (189420 = T₆₁₅).

The spelling of 18189402 in words is "eighteen million, one hundred eighty-nine thousand, four hundred two".