6466399 has 2 divisors, whose sum is σ = 6466400. Its totient is φ = 6466398.

The previous prime is 6466393. The next prime is 6466417. The reversal of 6466399 is 9936646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6466399 - 2⁵ = 6466367 is a prime.

It is a d-powerful number, because it can be written as 6² + 4⁵ + 6⁴ + 6⁸ + 3¹⁴ + 9³ + 9³ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6466393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233199 + 3233200.

It is an arithmetic number, because the mean of its divisors is an integer number (3233200).

Almost surely, 2^6466399 is an apocalyptic number.

6466399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466399 is an equidigital number, since it uses as much as digits as its factorization.

6466399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 43.

The square root of 6466399 is about 2542.9115202854. The cubic root of 6466399 is about 186.3034223583.

The spelling of 6466399 in words is "six million, four hundred sixty-six thousand, three hundred ninety-nine".