6400393 has 4 divisors (see below), whose sum is σ = 6410448. Its totient is φ = 6390340.

The previous prime is 6400391. The next prime is 6400403. The reversal of 6400393 is 3930046.

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.

It is a cyclic number.

It is not a de Polignac number, because 6400393 - 2¹ = 6400391 is a prime.

It is a Duffinian number.

6400393 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6400391) 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, 4003 + ... + 5368.

It is an arithmetic number, because the mean of its divisors is an integer number (1602612).

Almost surely, 2^6400393 is an apocalyptic number.

It is an amenable number.

6400393 is a deficient number, since it is larger than the sum of its proper divisors (10055).

6400393 is an equidigital number, since it uses as much as digits as its factorization.

6400393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10054.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 6400393 is about 2529.8998003874. The cubic root of 6400393 is about 185.6673535676.

The spelling of 6400393 in words is "six million, four hundred thousand, three hundred ninety-three".