402005447 has 2 divisors, whose sum is σ = 402005448. Its totient is φ = 402005446.

The previous prime is 402005413. The next prime is 402005449. The reversal of 402005447 is 744500204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402005447 - 2²² = 397811143 is a prime.

Together with 402005449, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_21437441 and since 402005447 and 21437441 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402005449) 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, 201002723 + 201002724.

It is an arithmetic number, because the mean of its divisors is an integer number (201002724).

Almost surely, 2^402005447 is an apocalyptic number.

402005447 is a deficient number, since it is larger than the sum of its proper divisors (1).

402005447 is an equidigital number, since it uses as much as digits as its factorization.

402005447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 402005447 is about 20050.0734911371. The cubic root of 402005447 is about 738.0356025793.

The spelling of 402005447 in words is "four hundred two million, five thousand, four hundred forty-seven".