402878093 has 2 divisors, whose sum is σ = 402878094. Its totient is φ = 402878092.

The previous prime is 402878041. The next prime is 402878101. The reversal of 402878093 is 390878204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204547204 + 198330889 = 14302^2 + 14083^2 .

It is a cyclic number.

It is not a de Polignac number, because 402878093 - 2⁶ = 402878029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 402878093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402875093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201439046 + 201439047.

It is an arithmetic number, because the mean of its divisors is an integer number (201439047).

Almost surely, 2^402878093 is an apocalyptic number.

It is an amenable number.

402878093 is a deficient number, since it is larger than the sum of its proper divisors (1).

402878093 is an equidigital number, since it uses as much as digits as its factorization.

402878093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 402878093 is about 20071.8233601235. The cubic root of 402878093 is about 738.5692424151.

The spelling of 402878093 in words is "four hundred two million, eight hundred seventy-eight thousand, ninety-three".