6404137 has 2 divisors, whose sum is σ = 6404138. Its totient is φ = 6404136.

The previous prime is 6404131. The next prime is 6404141. The reversal of 6404137 is 7314046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3904576 + 2499561 = 1976^2 + 1581^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404137 - 2⁷ = 6404009 is a prime.

It is not a weakly prime, because it can be changed into another prime (6404131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202068 + 3202069.

It is an arithmetic number, because the mean of its divisors is an integer number (3202069).

Almost surely, 2^6404137 is an apocalyptic number.

It is an amenable number.

6404137 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404137 is an equidigital number, since it uses as much as digits as its factorization.

6404137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 6404137 is about 2530.6396424620. The cubic root of 6404137 is about 185.7035494216.

Subtracting 6404137 from its reverse (7314046), we obtain a palindrome (909909).

The spelling of 6404137 in words is "six million, four hundred four thousand, one hundred thirty-seven".