6405401 has 4 divisors (see below), whose sum is σ = 6501072. Its totient is φ = 6309732.

The previous prime is 6405397. The next prime is 6405457. The reversal of 6405401 is 1045046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1045046 = 2 ⋅522523.

It is a cyclic number.

It is not a de Polignac number, because 6405401 - 2² = 6405397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6405461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47735 + ... + 47868.

It is an arithmetic number, because the mean of its divisors is an integer number (1625268).

Almost surely, 2^6405401 is an apocalyptic number.

It is an amenable number.

6405401 is a deficient number, since it is larger than the sum of its proper divisors (95671).

6405401 is an equidigital number, since it uses as much as digits as its factorization.

6405401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95670.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 6405401 is about 2530.8893693720. The cubic root of 6405401 is about 185.7157662040.

The spelling of 6405401 in words is "six million, four hundred five thousand, four hundred one".