1640411 has 4 divisors (see below), whose sum is σ = 1643832. Its totient is φ = 1636992.

The previous prime is 1640399. The next prime is 1640423. The reversal of 1640411 is 1140461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640399) and next prime (1640423).

It is a cyclic number.

It is not a de Polignac number, because 1640411 - 2¹⁰ = 1639387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640411.

It is not an unprimeable number, because it can be changed into a prime (1640461) 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, 845 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (410958).

2^1640411 is an apocalyptic number.

1640411 is a deficient number, since it is larger than the sum of its proper divisors (3421).

1640411 is an equidigital number, since it uses as much as digits as its factorization.

1640411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1640411 is about 1280.7853059744. The cubic root of 1640411 is about 117.9372212265.

Adding to 1640411 its reverse (1140461), we get a palindrome (2780872).

The spelling of 1640411 in words is "one million, six hundred forty thousand, four hundred eleven".