402790849 has 2 divisors, whose sum is σ = 402790850. Its totient is φ = 402790848.

The previous prime is 402790793. The next prime is 402790853. The reversal of 402790849 is 948097204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402604225 + 186624 = 20065^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 402790849 - 2²³ = 394402241 is a prime.

It is not a weakly prime, because it can be changed into another prime (402790249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201395424 + 201395425.

It is an arithmetic number, because the mean of its divisors is an integer number (201395425).

Almost surely, 2^402790849 is an apocalyptic number.

It is an amenable number.

402790849 is a deficient number, since it is larger than the sum of its proper divisors (1).

402790849 is an equidigital number, since it uses as much as digits as its factorization.

402790849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 402790849 is about 20069.6499471216. The cubic root of 402790849 is about 738.5159257188.

The spelling of 402790849 in words is "four hundred two million, seven hundred ninety thousand, eight hundred forty-nine".