18240577 has 2 divisors, whose sum is σ = 18240578. Its totient is φ = 18240576.

The previous prime is 18240529. The next prime is 18240581. The reversal of 18240577 is 77504281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 2944656 = 3911^2 + 1716^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240577 - 2¹⁵ = 18207809 is a prime.

It is not a weakly prime, because it can be changed into another prime (18240517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120288 + 9120289.

It is an arithmetic number, because the mean of its divisors is an integer number (9120289).

Almost surely, 2^18240577 is an apocalyptic number.

It is an amenable number.

18240577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240577 is an equidigital number, since it uses as much as digits as its factorization.

18240577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 18240577 is about 4270.8988515300. The cubic root of 18240577 is about 263.2365502728.

The spelling of 18240577 in words is "eighteen million, two hundred forty thousand, five hundred seventy-seven".