18040277 has 2 divisors, whose sum is σ = 18040278. Its totient is φ = 18040276.

The previous prime is 18040273. The next prime is 18040327. The reversal of 18040277 is 77204081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 391876 = 4201^2 + 626^2 .

It is an emirp because it is prime and its reverse (77204081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18040277 - 2² = 18040273 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 (18040273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020138 + 9020139.

It is an arithmetic number, because the mean of its divisors is an integer number (9020139).

Almost surely, 2^18040277 is an apocalyptic number.

It is an amenable number.

18040277 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040277 is an equidigital number, since it uses as much as digits as its factorization.

18040277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 18040277 is about 4247.3847247453. The cubic root of 18040277 is about 262.2694671395.

The spelling of 18040277 in words is "eighteen million, forty thousand, two hundred seventy-seven".