1640104 has 16 divisors (see below), whose sum is σ = 3088800. Its totient is φ = 816432.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640104 is 4010461.

It is a happy number.

It is a super-2 number, since 2×1640104² = 5379882261632, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3279 + ... + 3745.

It is an arithmetic number, because the mean of its divisors is an integer number (193050).

2^1640104 is an apocalyptic number.

It is an amenable number.

1640104 is a deficient number, since it is larger than the sum of its proper divisors (1448696).

1640104 is a wasteful number, since it uses less digits than its factorization.

1640104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1640104 is about 1280.6654520209. The cubic root of 1640104 is about 117.9298635204.

Adding to 1640104 its reverse (4010461), we get a palindrome (5650565).

The spelling of 1640104 in words is "one million, six hundred forty thousand, one hundred four".