6400349 has 2 divisors, whose sum is σ = 6400350. Its totient is φ = 6400348.

The previous prime is 6400259. The next prime is 6400357. The reversal of 6400349 is 9430046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6340324 + 60025 = 2518^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400349 - 2¹⁶ = 6334813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200174 + 3200175.

It is an arithmetic number, because the mean of its divisors is an integer number (3200175).

Almost surely, 2^6400349 is an apocalyptic number.

It is an amenable number.

6400349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400349 is an equidigital number, since it uses as much as digits as its factorization.

6400349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 6400349 is about 2529.8911043758. The cubic root of 6400349 is about 185.6669281050. Note that the first 3 decimals are identical.

The spelling of 6400349 in words is "six million, four hundred thousand, three hundred forty-nine".