6441399 has 24 divisors (see below), whose sum is σ = 9900800. Its totient is φ = 4024080.

The previous prime is 6441389. The next prime is 6441427. The reversal of 6441399 is 9931446.

6441399 is a `hidden beast` number, since 644 + 1 + 3 + 9 + 9 = 666.

It is not a de Polignac number, because 6441399 - 2¹² = 6437303 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

Its product of digits (23328) is a multiple of the sum of its prime divisors (432).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6441319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23634 + ... + 23904.

Almost surely, 2^6441399 is an apocalyptic number.

6441399 is a deficient number, since it is larger than the sum of its proper divisors (3459401).

6441399 is a wasteful number, since it uses less digits than its factorization.

6441399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 432 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 6441399 is about 2537.9911347363. The cubic root of 6441399 is about 186.0630206151.

The spelling of 6441399 in words is "six million, four hundred forty-one thousand, three hundred ninety-nine".