402381977 has 2 divisors, whose sum is σ = 402381978. Its totient is φ = 402381976.

The previous prime is 402381949. The next prime is 402381979. The reversal of 402381977 is 779183204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402363481 + 18496 = 20059^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402381977 is a prime.

It is a super-2 number, since 2×402381977² = 323822510828857058, which contains 22 as substring.

Together with 402381979, 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 (402381979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201190988 + 201190989.

It is an arithmetic number, because the mean of its divisors is an integer number (201190989).

Almost surely, 2^402381977 is an apocalyptic number.

It is an amenable number.

402381977 is a deficient number, since it is larger than the sum of its proper divisors (1).

402381977 is an equidigital number, since it uses as much as digits as its factorization.

402381977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 402381977 is about 20059.4610346340. The cubic root of 402381977 is about 738.2659525508.

The spelling of 402381977 in words is "four hundred two million, three hundred eighty-one thousand, nine hundred seventy-seven".