1919448705990 has 64 divisors (see below), whose sum is σ = 4750368270336. Its totient is φ = 496098748032.

The previous prime is 1919448705973. The next prime is 1919448706051. The reversal of 1919448705990 is 995078449191.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6463077 + ... + 6753536.

It is an arithmetic number, because the mean of its divisors is an integer number (74224504224).

Almost surely, 2^{1919448705990} is an apocalyptic number.

1919448705990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1919448705990 is an abundant number, since it is smaller than the sum of its proper divisors (2830919564346).

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

1919448705990 is a wasteful number, since it uses less digits than its factorization.

1919448705990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216773.

The product of its (nonzero) digits is 29393280, while the sum is 66.

The spelling of 1919448705990 in words is "one trillion, nine hundred nineteen billion, four hundred forty-eight million, seven hundred five thousand, nine hundred ninety".