402401647 has 2 divisors, whose sum is σ = 402401648. Its totient is φ = 402401646.

The previous prime is 402401621. The next prime is 402401683. The reversal of 402401647 is 746104204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402401647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402401147) 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, 201200823 + 201200824.

It is an arithmetic number, because the mean of its divisors is an integer number (201200824).

Almost surely, 2^402401647 is an apocalyptic number.

402401647 is a deficient number, since it is larger than the sum of its proper divisors (1).

402401647 is an equidigital number, since it uses as much as digits as its factorization.

402401647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 402401647 is about 20059.9513209778. The cubic root of 402401647 is about 738.2779821276.

The spelling of 402401647 in words is "four hundred two million, four hundred one thousand, six hundred forty-seven".