18420134 has 4 divisors (see below), whose sum is σ = 27630204. Its totient is φ = 9210066.

The previous prime is 18420119. The next prime is 18420151. The reversal of 18420134 is 43102481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43102481 = 83 ⋅519307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4605032 + ... + 4605035.

It is an arithmetic number, because the mean of its divisors is an integer number (6907551).

Almost surely, 2^18420134 is an apocalyptic number.

18420134 is a deficient number, since it is larger than the sum of its proper divisors (9210070).

18420134 is an equidigital number, since it uses as much as digits as its factorization.

18420134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210069.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18420134 is about 4291.8683577202. The cubic root of 18420134 is about 264.0974827479.

The spelling of 18420134 in words is "eighteen million, four hundred twenty thousand, one hundred thirty-four".