1640413 has 4 divisors (see below), whose sum is σ = 1645020. Its totient is φ = 1635808.

The previous prime is 1640399. The next prime is 1640423. The reversal of 1640413 is 3140461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3140461 = 17 ⋅184733.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 683929 = 978^2 + 827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640413 - 2⁹ = 1639901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640423) 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, 1720 + ... + 2497.

It is an arithmetic number, because the mean of its divisors is an integer number (411255).

2^1640413 is an apocalyptic number.

It is an amenable number.

1640413 is a deficient number, since it is larger than the sum of its proper divisors (4607).

1640413 is an equidigital number, since it uses as much as digits as its factorization.

1640413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1640413 is about 1280.7860867452. The cubic root of 1640413 is about 117.9372691564.

Adding to 1640413 its reverse (3140461), we get a palindrome (4780874).

The spelling of 1640413 in words is "one million, six hundred forty thousand, four hundred thirteen".