1919612139 has 8 divisors (see below), whose sum is σ = 2564828160. Its totient is φ = 1277068776.

The previous prime is 1919612129. The next prime is 1919612197. The reversal of 1919612139 is 9312169191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1919612139 - 2¹³ = 1919603947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1919612139.

It is not an unprimeable number, because it can be changed into a prime (1919612129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666487 + ... + 669360.

It is an arithmetic number, because the mean of its divisors is an integer number (320603520).

Almost surely, 2^1919612139 is an apocalyptic number.

1919612139 is a deficient number, since it is larger than the sum of its proper divisors (645216021).

1919612139 is a wasteful number, since it uses less digits than its factorization.

1919612139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336329.

The product of its digits is 26244, while the sum is 42.

The square root of 1919612139 is about 43813.3785389805. The cubic root of 1919612139 is about 1242.8093040851.

The spelling of 1919612139 in words is "one billion, nine hundred nineteen million, six hundred twelve thousand, one hundred thirty-nine".