6409399 has 8 divisors (see below), whose sum is σ = 6615648. Its totient is φ = 6204960.

The previous prime is 6409397. The next prime is 6409409. The reversal of 6409399 is 9939046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6409399 - 2¹ = 6409397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6409393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11229 + ... + 11785.

It is an arithmetic number, because the mean of its divisors is an integer number (826956).

Almost surely, 2^6409399 is an apocalyptic number.

6409399 is a deficient number, since it is larger than the sum of its proper divisors (206249).

6409399 is a wasteful number, since it uses less digits than its factorization.

6409399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 6409399 is about 2531.6790870883. The cubic root of 6409399 is about 185.7543969996.

It can be divided in two parts, 6409 and 399, that multiplied together give a triangular number (2557191 = T₂₂₆₁).

The spelling of 6409399 in words is "six million, four hundred nine thousand, three hundred ninety-nine".