18081642 has 32 divisors (see below), whose sum is σ = 38491200. Its totient is φ = 5643008.

The previous prime is 18081631. The next prime is 18081643. The reversal of 18081642 is 24618081.

It is not an unprimeable number, because it can be changed into a prime (18081643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27109 + ... + 27767.

It is an arithmetic number, because the mean of its divisors is an integer number (1202850).

Almost surely, 2^18081642 is an apocalyptic number.

18081642 is an abundant number, since it is smaller than the sum of its proper divisors (20409558).

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

18081642 is a wasteful number, since it uses less digits than its factorization.

18081642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18081642 is about 4252.2514036684. The cubic root of 18081642 is about 262.4697688541.

The spelling of 18081642 in words is "eighteen million, eighty-one thousand, six hundred forty-two".