18978067 has 2 divisors, whose sum is σ = 18978068. Its totient is φ = 18978066.

The previous prime is 18978053. The next prime is 18978073. The reversal of 18978067 is 76087981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18978067 - 2⁷ = 18977939 is a prime.

It is not a weakly prime, because it can be changed into another prime (18978097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489033 + 9489034.

It is an arithmetic number, because the mean of its divisors is an integer number (9489034).

Almost surely, 2^18978067 is an apocalyptic number.

18978067 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978067 is an equidigital number, since it uses as much as digits as its factorization.

18978067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 18978067 is about 4356.3823294105. The cubic root of 18978067 is about 266.7374480511.

The spelling of 18978067 in words is "eighteen million, nine hundred seventy-eight thousand, sixty-seven".