18402542 has 8 divisors (see below), whose sum is σ = 28349976. Its totient is φ = 8952552.

The previous prime is 18402539. The next prime is 18402557. The reversal of 18402542 is 24520481.

It is a happy number.

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

It is a plaindrome in base 16.

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 3 ways as a sum of consecutive naturals, for example, 124268 + ... + 124415.

It is an arithmetic number, because the mean of its divisors is an integer number (3543747).

Almost surely, 2^18402542 is an apocalyptic number.

18402542 is a deficient number, since it is larger than the sum of its proper divisors (9947434).

18402542 is a wasteful number, since it uses less digits than its factorization.

18402542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248722.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18402542 is about 4289.8184110752. The cubic root of 18402542 is about 264.0133812471.

The spelling of 18402542 in words is "eighteen million, four hundred two thousand, five hundred forty-two".