402370861 has 2 divisors, whose sum is σ = 402370862. Its totient is φ = 402370860.

The previous prime is 402370849. The next prime is 402370877. The reversal of 402370861 is 168073204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379041961 + 23328900 = 19469^2 + 4830^2 .

It is a cyclic number.

It is not a de Polignac number, because 402370861 - 2¹⁵ = 402338093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402370831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201185430 + 201185431.

It is an arithmetic number, because the mean of its divisors is an integer number (201185431).

Almost surely, 2^402370861 is an apocalyptic number.

It is an amenable number.

402370861 is a deficient number, since it is larger than the sum of its proper divisors (1).

402370861 is an equidigital number, since it uses as much as digits as its factorization.

402370861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 402370861 is about 20059.1839564824. The cubic root of 402370861 is about 738.2591541682.

The spelling of 402370861 in words is "four hundred two million, three hundred seventy thousand, eight hundred sixty-one".