18875749 has 2 divisors, whose sum is σ = 18875750. Its totient is φ = 18875748.

The previous prime is 18875741. The next prime is 18875761. The reversal of 18875749 is 94757881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 540225 = 4282^2 + 735^2 .

It is a cyclic number.

It is not a de Polignac number, because 18875749 - 2³ = 18875741 is a prime.

It is a super-2 number, since 2×18875749² = 712587800622002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18875741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437874 + 9437875.

It is an arithmetic number, because the mean of its divisors is an integer number (9437875).

Almost surely, 2^18875749 is an apocalyptic number.

It is an amenable number.

18875749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18875749 is an equidigital number, since it uses as much as digits as its factorization.

18875749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 18875749 is about 4344.6229986041. The cubic root of 18875749 is about 266.2572228712.

The spelling of 18875749 in words is "eighteen million, eight hundred seventy-five thousand, seven hundred forty-nine".