18879907 has 2 divisors, whose sum is σ = 18879908. Its totient is φ = 18879906.

The previous prime is 18879893. The next prime is 18879919. The reversal of 18879907 is 70997881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18879907 is a prime.

It is not a weakly prime, because it can be changed into another prime (18871907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439953 + 9439954.

It is an arithmetic number, because the mean of its divisors is an integer number (9439954).

Almost surely, 2^18879907 is an apocalyptic number.

18879907 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879907 is an equidigital number, since it uses as much as digits as its factorization.

18879907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 18879907 is about 4345.1014947870. The cubic root of 18879907 is about 266.2767720513.

The spelling of 18879907 in words is "eighteen million, eight hundred seventy-nine thousand, nine hundred seven".