1919873634 has 16 divisors (see below), whose sum is σ = 4388282688. Its totient is φ = 548535312.

The previous prime is 1919873621. The next prime is 1919873651. The reversal of 1919873634 is 4363789191.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 22855597 + ... + 22855680.

It is an arithmetic number, because the mean of its divisors is an integer number (274267668).

Almost surely, 2^1919873634 is an apocalyptic number.

1919873634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1919873634 is an abundant number, since it is smaller than the sum of its proper divisors (2468409054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1919873634 is a wasteful number, since it uses less digits than its factorization.

1919873634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45711289.

The product of its digits is 979776, while the sum is 51.

The square root of 1919873634 is about 43816.3626285889. The cubic root of 1919873634 is about 1242.8657345234.

The spelling of 1919873634 in words is "one billion, nine hundred nineteen million, eight hundred seventy-three thousand, six hundred thirty-four".