18461478 has 16 divisors (see below), whose sum is σ = 42197760. Its totient is φ = 5274696.

The previous prime is 18461477. The next prime is 18461489. The reversal of 18461478 is 87416481.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18461477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219738 + ... + 219821.

It is an arithmetic number, because the mean of its divisors is an integer number (2637360).

Almost surely, 2^18461478 is an apocalyptic number.

18461478 is an abundant number, since it is smaller than the sum of its proper divisors (23736282).

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

18461478 is a wasteful number, since it uses less digits than its factorization.

18461478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439571.

The product of its digits is 43008, while the sum is 39.

The square root of 18461478 is about 4296.6822084022. The cubic root of 18461478 is about 264.2949240799.

Adding to 18461478 its product of digits (43008), we get a triangular number (18504486 = T₆₀₈₃).

The spelling of 18461478 in words is "eighteen million, four hundred sixty-one thousand, four hundred seventy-eight".