18053442 has 72 divisors (see below), whose sum is σ = 44732688. Its totient is φ = 5452920.

The previous prime is 18053429. The next prime is 18053461. The reversal of 18053442 is 24435081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 58653 + ... + 58959.

Almost surely, 2^18053442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18053442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22366344).

18053442 is an abundant number, since it is smaller than the sum of its proper divisors (26679246).

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

18053442 is a wasteful number, since it uses less digits than its factorization.

18053442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18053442 is about 4248.9342193072. The cubic root of 18053442 is about 262.3332491975. Note that the first 3 decimals are identical.

The spelling of 18053442 in words is "eighteen million, fifty-three thousand, four hundred forty-two".