390636042649 has 2 divisors, whose sum is σ = 390636042650. Its totient is φ = 390636042648.

The previous prime is 390636042613. The next prime is 390636042683. The reversal of 390636042649 is 946240636093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214802587024 + 175833455625 = 463468^2 + 419325^2 .

It is an emirp because it is prime and its reverse (946240636093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390636042649 - 2²¹ = 390633945497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390636042596 and 390636042605.

It is not a weakly prime, because it can be changed into another prime (390636022649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195318021324 + 195318021325.

It is an arithmetic number, because the mean of its divisors is an integer number (195318021325).

Almost surely, 2^390636042649 is an apocalyptic number.

It is an amenable number.

390636042649 is a deficient number, since it is larger than the sum of its proper divisors (1).

390636042649 is an equidigital number, since it uses as much as digits as its factorization.

390636042649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 52.

The spelling of 390636042649 in words is "three hundred ninety billion, six hundred thirty-six million, forty-two thousand, six hundred forty-nine".