18678461 has 24 divisors (see below), whose sum is σ = 21659904. Its totient is φ = 16030080.

The previous prime is 18678433. The next prime is 18678481. The reversal of 18678461 is 16487681.

It is a de Polignac number, because none of the positive numbers 2^k-18678461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278750 + ... + 278816.

It is an arithmetic number, because the mean of its divisors is an integer number (902496).

Almost surely, 2^18678461 is an apocalyptic number.

It is an amenable number.

18678461 is a deficient number, since it is larger than the sum of its proper divisors (2981443).

18678461 is a wasteful number, since it uses less digits than its factorization.

18678461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 138 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 18678461 is about 4321.8585122607. The cubic root of 18678461 is about 265.3263382007.

The spelling of 18678461 in words is "eighteen million, six hundred seventy-eight thousand, four hundred sixty-one".