1640363 has 4 divisors (see below), whose sum is σ = 1646688. Its totient is φ = 1634040.

The previous prime is 1640333. The next prime is 1640393. The reversal of 1640363 is 3630461.

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 (1640333) and next prime (1640393).

It is a cyclic number.

It is not a de Polignac number, because 1640363 - 2⁶ = 1640299 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2756 + ... + 3297.

It is an arithmetic number, because the mean of its divisors is an integer number (411672).

2^1640363 is an apocalyptic number.

1640363 is a deficient number, since it is larger than the sum of its proper divisors (6325).

1640363 is an equidigital number, since it uses as much as digits as its factorization.

1640363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1640363 is about 1280.7665673338. The cubic root of 1640363 is about 117.9360708965.

The spelling of 1640363 in words is "one million, six hundred forty thousand, three hundred sixty-three".