1943778444 has 12 divisors (see below), whose sum is σ = 4535483064. Its totient is φ = 647926144.

The previous prime is 1943778439. The next prime is 1943778467. The reversal of 1943778444 is 4448773491.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1943778444² = 7556549278718122272, which contains 22 as substring.

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, 80990757 + ... + 80990780.

It is an arithmetic number, because the mean of its divisors is an integer number (377956922).

Almost surely, 2^1943778444 is an apocalyptic number.

It is an amenable number.

1943778444 is an abundant number, since it is smaller than the sum of its proper divisors (2591704620).

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

1943778444 is a wasteful number, since it uses less digits than its factorization.

1943778444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161981544 (or 161981542 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 51.

The square root of 1943778444 is about 44088.3028024441. The cubic root of 1943778444 is about 1248.0028789587.

The spelling of 1943778444 in words is "one billion, nine hundred forty-three million, seven hundred seventy-eight thousand, four hundred forty-four".