6409138 has 4 divisors (see below), whose sum is σ = 9613710. Its totient is φ = 3204568.

The previous prime is 6409133. The next prime is 6409141. The reversal of 6409138 is 8319046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8319046 = 2 ⋅4159523.

It can be written as a sum of positive squares in only one way, i.e., 6385729 + 23409 = 2527^2 + 153^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6409133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602283 + ... + 1602286.

Almost surely, 2^6409138 is an apocalyptic number.

6409138 is a deficient number, since it is larger than the sum of its proper divisors (3204572).

6409138 is a wasteful number, since it uses less digits than its factorization.

6409138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204571.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 6409138 is about 2531.6275397459. The cubic root of 6409138 is about 185.7518755694.

The spelling of 6409138 in words is "six million, four hundred nine thousand, one hundred thirty-eight".