18787542 has 32 divisors (see below), whose sum is σ = 39984000. Its totient is φ = 5868288.

The previous prime is 18787513. The next prime is 18787579. The reversal of 18787542 is 24578781.

It is a junction number, because it is equal to n+sod(n) for n = 18787494 and 18787503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10209 + ... + 11907.

It is an arithmetic number, because the mean of its divisors is an integer number (1249500).

Almost surely, 2^18787542 is an apocalyptic number.

18787542 is an abundant number, since it is smaller than the sum of its proper divisors (21196458).

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

18787542 is a wasteful number, since it uses less digits than its factorization.

18787542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820.

The product of its digits is 125440, while the sum is 42.

The square root of 18787542 is about 4334.4598279370. The cubic root of 18787542 is about 265.8418322138.

The spelling of 18787542 in words is "eighteen million, seven hundred eighty-seven thousand, five hundred forty-two".