1649037443 has 4 divisors (see below), whose sum is σ = 1668905448. Its totient is φ = 1629169440.

The previous prime is 1649037437. The next prime is 1649037449. The reversal of 1649037443 is 3447309461.

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 (1649037437) and next prime (1649037449).

It is a cyclic number.

It is not a de Polignac number, because 1649037443 - 2²² = 1644843139 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 1649037443.

It is not an unprimeable number, because it can be changed into a prime (1649037449) 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, 9933878 + ... + 9934043.

It is an arithmetic number, because the mean of its divisors is an integer number (417226362).

Almost surely, 2^1649037443 is an apocalyptic number.

1649037443 is a deficient number, since it is larger than the sum of its proper divisors (19868005).

1649037443 is an equidigital number, since it uses as much as digits as its factorization.

1649037443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19868004.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 1649037443 is about 40608.3420370741. The cubic root of 1649037443 is about 1181.4359238231.

The spelling of 1649037443 in words is "one billion, six hundred forty-nine million, thirty-seven thousand, four hundred forty-three".