18161902 has 16 divisors (see below), whose sum is σ = 29890224. Its totient is φ = 8208000.

The previous prime is 18161851. The next prime is 18161903. The reversal of 18161902 is 20916181.

It is a happy number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161903) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1702 + ... + 6262.

It is an arithmetic number, because the mean of its divisors is an integer number (1868139).

Almost surely, 2^18161902 is an apocalyptic number.

18161902 is a deficient number, since it is larger than the sum of its proper divisors (11728322).

18161902 is a wasteful number, since it uses less digits than its factorization.

18161902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 18161902 is about 4261.6783078970. The cubic root of 18161902 is about 262.8575421105.

The spelling of 18161902 in words is "eighteen million, one hundred sixty-one thousand, nine hundred two".