18341978 has 8 divisors (see below), whose sum is σ = 28461780. Its totient is φ = 8854720.

The previous prime is 18341969. The next prime is 18342013. The reversal of 18341978 is 87914381.

It can be written as a sum of positive squares in 2 ways, for example, as 18207289 + 134689 = 4267^2 + 367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158063 + ... + 158178.

Almost surely, 2^18341978 is an apocalyptic number.

18341978 is a deficient number, since it is larger than the sum of its proper divisors (10119802).

18341978 is a wasteful number, since it uses less digits than its factorization.

18341978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316272.

The product of its digits is 48384, while the sum is 41.

The square root of 18341978 is about 4282.7535534980. The cubic root of 18341978 is about 263.7234343540.

The spelling of 18341978 in words is "eighteen million, three hundred forty-one thousand, nine hundred seventy-eight".