1949971803 has 16 divisors (see below), whose sum is σ = 2896511520. Its totient is φ = 1158603264.

The previous prime is 1949971781. The next prime is 1949971841. The reversal of 1949971803 is 3081799491.

It is a happy number.

It is not a de Polignac number, because 1949971803 - 2⁶ = 1949971739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1949971853) 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 15 ways as a sum of consecutive naturals, for example, 860926 + ... + 863187.

It is an arithmetic number, because the mean of its divisors is an integer number (181031970).

Almost surely, 2^1949971803 is an apocalyptic number.

1949971803 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1949971803 is a deficient number, since it is larger than the sum of its proper divisors (946539717).

1949971803 is a wasteful number, since it uses less digits than its factorization.

1949971803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724158.

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 1949971803 is about 44158.4850623298. The cubic root of 1949971803 is about 1249.3269556474.

The spelling of 1949971803 in words is "one billion, nine hundred forty-nine million, nine hundred seventy-one thousand, eight hundred three".