18383977 has 2 divisors, whose sum is σ = 18383978. Its totient is φ = 18383976.

The previous prime is 18383971. The next prime is 18384007. The reversal of 18383977 is 77938381.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 4575321 = 3716^2 + 2139^2 .

It is an emirp because it is prime and its reverse (77938381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18383977 - 2¹⁵ = 18351209 is a prime.

It is a super-2 number, since 2×18383977² = 675941220673058, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18383971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191988 + 9191989.

It is an arithmetic number, because the mean of its divisors is an integer number (9191989).

Almost surely, 2^18383977 is an apocalyptic number.

It is an amenable number.

18383977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18383977 is an equidigital number, since it uses as much as digits as its factorization.

18383977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 18383977 is about 4287.6540205572. The cubic root of 18383977 is about 263.9245700098.

The spelling of 18383977 in words is "eighteen million, three hundred eighty-three thousand, nine hundred seventy-seven".