18866741 has 2 divisors, whose sum is σ = 18866742. Its totient is φ = 18866740.

The previous prime is 18866671. The next prime is 18866773. The reversal of 18866741 is 14766881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14092516 + 4774225 = 3754^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 18866741 - 2¹⁴ = 18850357 is a prime.

It is a super-2 number, since 2×18866741² = 711907831922162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18866641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433370 + 9433371.

It is an arithmetic number, because the mean of its divisors is an integer number (9433371).

Almost surely, 2^18866741 is an apocalyptic number.

It is an amenable number.

18866741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18866741 is an equidigital number, since it uses as much as digits as its factorization.

18866741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 18866741 is about 4343.5861911559. The cubic root of 18866741 is about 266.2148611668.

The spelling of 18866741 in words is "eighteen million, eight hundred sixty-six thousand, seven hundred forty-one".