402666457 has 2 divisors, whose sum is σ = 402666458. Its totient is φ = 402666456.

The previous prime is 402666401. The next prime is 402666461. The reversal of 402666457 is 754666204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366377881 + 36288576 = 19141^2 + 6024^2 .

It is a cyclic number.

It is not a de Polignac number, because 402666457 - 2¹⁵ = 402633689 is a prime.

It is not a weakly prime, because it can be changed into another prime (402666557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201333228 + 201333229.

It is an arithmetic number, because the mean of its divisors is an integer number (201333229).

Almost surely, 2^402666457 is an apocalyptic number.

It is an amenable number.

402666457 is a deficient number, since it is larger than the sum of its proper divisors (1).

402666457 is an equidigital number, since it uses as much as digits as its factorization.

402666457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 402666457 is about 20066.5507001079. The cubic root of 402666457 is about 738.4398937602.

The spelling of 402666457 in words is "four hundred two million, six hundred sixty-six thousand, four hundred fifty-seven".