18672438 has 16 divisors (see below), whose sum is σ = 37978560. Its totient is φ = 6118536.

The previous prime is 18672419. The next prime is 18672461. The reversal of 18672438 is 83427681.

It is a junction number, because it is equal to n+sod(n) for n = 18672396 and 18672405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26020 + ... + 26727.

It is an arithmetic number, because the mean of its divisors is an integer number (2373660).

Almost surely, 2^18672438 is an apocalyptic number.

18672438 is an abundant number, since it is smaller than the sum of its proper divisors (19306122).

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

18672438 is a wasteful number, since it uses less digits than its factorization.

18672438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52811.

The product of its digits is 64512, while the sum is 39.

The square root of 18672438 is about 4321.1616493716. The cubic root of 18672438 is about 265.2978163588.

It can be divided in two parts, 18672 and 438, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18672438 in words is "eighteen million, six hundred seventy-two thousand, four hundred thirty-eight".