402392381 has 2 divisors, whose sum is σ = 402392382. Its totient is φ = 402392380.

The previous prime is 402392359. The next prime is 402392399. The reversal of 402392381 is 183293204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402363481 + 28900 = 20059^2 + 170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402392381 is a prime.

It is a super-2 number, since 2×402392381² = 323839256573698322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402392321) 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, 201196190 + 201196191.

It is an arithmetic number, because the mean of its divisors is an integer number (201196191).

Almost surely, 2^402392381 is an apocalyptic number.

It is an amenable number.

402392381 is a deficient number, since it is larger than the sum of its proper divisors (1).

402392381 is an equidigital number, since it uses as much as digits as its factorization.

402392381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 402392381 is about 20059.7203619592. The cubic root of 402392381 is about 738.2723153712.

The spelling of 402392381 in words is "four hundred two million, three hundred ninety-two thousand, three hundred eighty-one".