18450438 has 32 divisors (see below), whose sum is σ = 38568960. Its totient is φ = 5876640.

The previous prime is 18450437. The next prime is 18450469. The reversal of 18450438 is 83405481.

It is a junction number, because it is equal to n+sod(n) for n = 18450399 and 18450408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18450437) 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, 18123 + ... + 19113.

It is an arithmetic number, because the mean of its divisors is an integer number (1205280).

Almost surely, 2^18450438 is an apocalyptic number.

18450438 is an abundant number, since it is smaller than the sum of its proper divisors (20118522).

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

18450438 is a wasteful number, since it uses less digits than its factorization.

18450438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 18450438 is about 4295.3973040919. The cubic root of 18450438 is about 264.2422306142.

The spelling of 18450438 in words is "eighteen million, four hundred fifty thousand, four hundred thirty-eight".