1949638043 has 4 divisors (see below), whose sum is σ = 1950032280. Its totient is φ = 1949243808.

The previous prime is 1949638021. The next prime is 1949638049. The reversal of 1949638043 is 3408369491.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1949638043 - 2⁸ = 1949637787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949638049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189605 + ... + 199622.

It is an arithmetic number, because the mean of its divisors is an integer number (487508070).

Almost surely, 2^1949638043 is an apocalyptic number.

1949638043 is a deficient number, since it is larger than the sum of its proper divisors (394237).

1949638043 is an equidigital number, since it uses as much as digits as its factorization.

1949638043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394236.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 1949638043 is about 44154.7057854539. The cubic root of 1949638043 is about 1249.2556727095.

The spelling of 1949638043 in words is "one billion, nine hundred forty-nine million, six hundred thirty-eight thousand, forty-three".