18949877 has 2 divisors, whose sum is σ = 18949878. Its totient is φ = 18949876.

The previous prime is 18949867. The next prime is 18949949. The reversal of 18949877 is 77894981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13256881 + 5692996 = 3641^2 + 2386^2 .

It is an emirp because it is prime and its reverse (77894981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18949877 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 (18949817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474938 + 9474939.

It is an arithmetic number, because the mean of its divisors is an integer number (9474939).

Almost surely, 2^18949877 is an apocalyptic number.

It is an amenable number.

18949877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949877 is an equidigital number, since it uses as much as digits as its factorization.

18949877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 18949877 is about 4353.1456442439. The cubic root of 18949877 is about 266.6053120999.

The spelling of 18949877 in words is "eighteen million, nine hundred forty-nine thousand, eight hundred seventy-seven".