402169379 has 2 divisors, whose sum is σ = 402169380. Its totient is φ = 402169378.

The previous prime is 402169351. The next prime is 402169381. The reversal of 402169379 is 973961204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402169379 is a prime.

Together with 402169381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402169399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201084689 + 201084690.

It is an arithmetic number, because the mean of its divisors is an integer number (201084690).

Almost surely, 2^402169379 is an apocalyptic number.

402169379 is a deficient number, since it is larger than the sum of its proper divisors (1).

402169379 is an equidigital number, since it uses as much as digits as its factorization.

402169379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 402169379 is about 20054.1611392748. The cubic root of 402169379 is about 738.1359090232.

The spelling of 402169379 in words is "four hundred two million, one hundred sixty-nine thousand, three hundred seventy-nine".