18874481 has 2 divisors, whose sum is σ = 18874482. Its totient is φ = 18874480.

The previous prime is 18874459. The next prime is 18874483. The reversal of 18874481 is 18447881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14938225 + 3936256 = 3865^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 18874481 - 2⁶ = 18874417 is a prime.

It is a super-2 number, since 2×18874481² = 712492066038722, which contains 22 as substring.

Together with 18874483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18874483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437240 + 9437241.

It is an arithmetic number, because the mean of its divisors is an integer number (9437241).

Almost surely, 2^18874481 is an apocalyptic number.

It is an amenable number.

18874481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18874481 is an equidigital number, since it uses as much as digits as its factorization.

18874481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 41.

The square root of 18874481 is about 4344.4770686470. The cubic root of 18874481 is about 266.2512606933.

The spelling of 18874481 in words is "eighteen million, eight hundred seventy-four thousand, four hundred eighty-one".