18941807 has 2 divisors, whose sum is σ = 18941808. Its totient is φ = 18941806.

The previous prime is 18941789. The next prime is 18941849. The reversal of 18941807 is 70814981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18941807 - 2¹⁸ = 18679663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18941207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470903 + 9470904.

It is an arithmetic number, because the mean of its divisors is an integer number (9470904).

Almost surely, 2^18941807 is an apocalyptic number.

18941807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18941807 is an equidigital number, since it uses as much as digits as its factorization.

18941807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18941807 is about 4352.2186296187. The cubic root of 18941807 is about 266.5674611884.

The spelling of 18941807 in words is "eighteen million, nine hundred forty-one thousand, eight hundred seven".