6401409 has 16 divisors (see below), whose sum is σ = 9955200. Its totient is φ = 3657360.

The previous prime is 6401399. The next prime is 6401411. The reversal of 6401409 is 9041046.

It is not a de Polignac number, because 6401409 - 2⁵ = 6401377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6401419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 4139.

It is an arithmetic number, because the mean of its divisors is an integer number (622200).

Almost surely, 2^6401409 is an apocalyptic number.

It is an amenable number.

6401409 is a deficient number, since it is larger than the sum of its proper divisors (3553791).

6401409 is an equidigital number, since it uses as much as digits as its factorization.

6401409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6245 (or 6231 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6401409 is about 2530.1005908857. The cubic root of 6401409 is about 185.6771773420.

The spelling of 6401409 in words is "six million, four hundred one thousand, four hundred nine".