1919138278140 has 72 divisors (see below), whose sum is σ = 5821498868640. Its totient is φ = 511760294784.

The previous prime is 1919138278129. The next prime is 1919138278157. The reversal of 1919138278140 is 418728319191.

1919138278140 is a `hidden beast` number, since 1 + 9 + 191 + 382 + 78 + 1 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18430302 + ... + 18534138.

Almost surely, 2^{1919138278140} is an apocalyptic number.

1919138278140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919138278140 is an abundant number, since it is smaller than the sum of its proper divisors (3902360590500).

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

1919138278140 is a wasteful number, since it uses less digits than its factorization.

1919138278140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206531 (or 206526 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 1919138278140 in words is "one trillion, nine hundred nineteen billion, one hundred thirty-eight million, two hundred seventy-eight thousand, one hundred forty".