18249877 has 2 divisors, whose sum is σ = 18249878. Its totient is φ = 18249876.

The previous prime is 18249841. The next prime is 18249923. The reversal of 18249877 is 77894281.

It is an a-pointer prime, because the next prime (18249923) can be obtained adding 18249877 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12895281 + 5354596 = 3591^2 + 2314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18249877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18249817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124938 + 9124939.

It is an arithmetic number, because the mean of its divisors is an integer number (9124939).

Almost surely, 2^18249877 is an apocalyptic number.

It is an amenable number.

18249877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249877 is an equidigital number, since it uses as much as digits as its factorization.

18249877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 18249877 is about 4271.9874765734. The cubic root of 18249877 is about 263.2812799247.

The spelling of 18249877 in words is "eighteen million, two hundred forty-nine thousand, eight hundred seventy-seven".