18402142 has 16 divisors (see below), whose sum is σ = 30178800. Its totient is φ = 8346240.

The previous prime is 18402119. The next prime is 18402157. The reversal of 18402142 is 24120481.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17734 + ... + 18742.

It is an arithmetic number, because the mean of its divisors is an integer number (1886175).

Almost surely, 2^18402142 is an apocalyptic number.

18402142 is a deficient number, since it is larger than the sum of its proper divisors (11776658).

18402142 is a wasteful number, since it uses less digits than its factorization.

18402142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 18402142 is about 4289.7717888018. The cubic root of 18402142 is about 264.0114683570.

The spelling of 18402142 in words is "eighteen million, four hundred two thousand, one hundred forty-two".