19144773940 has 12 divisors (see below), whose sum is σ = 40204025316. Its totient is φ = 7657909568.

The previous prime is 19144773937. The next prime is 19144773961. The reversal of 19144773940 is 4937744191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2358462096 + 16786311844 = 48564^2 + 129562^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478619329 + ... + 478619368.

It is an arithmetic number, because the mean of its divisors is an integer number (3350335443).

Almost surely, 2^19144773940 is an apocalyptic number.

19144773940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19144773940 is an abundant number, since it is smaller than the sum of its proper divisors (21059251376).

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

19144773940 is a wasteful number, since it uses less digits than its factorization.

19144773940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957238706 (or 957238704 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 19144773940 in words is "nineteen billion, one hundred forty-four million, seven hundred seventy-three thousand, nine hundred forty".