18434138 has 4 divisors (see below), whose sum is σ = 27651210. Its totient is φ = 9217068.

The previous prime is 18434113. The next prime is 18434153. The reversal of 18434138 is 83143481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83143481 = 17 ⋅4890793.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 4721929 = 3703^2 + 2173^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4608533 + ... + 4608536.

Almost surely, 2^18434138 is an apocalyptic number.

18434138 is a deficient number, since it is larger than the sum of its proper divisors (9217072).

18434138 is an equidigital number, since it uses as much as digits as its factorization.

18434138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217071.

The product of its digits is 9216, while the sum is 32.

The square root of 18434138 is about 4293.4995050658. The cubic root of 18434138 is about 264.1643929433.

The spelling of 18434138 in words is "eighteen million, four hundred thirty-four thousand, one hundred thirty-eight".