1889778404 has 12 divisors (see below), whose sum is σ = 3396493884. Its totient is φ = 919351584.

The previous prime is 1889778379. The next prime is 1889778431. The reversal of 1889778404 is 4048779881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1278205504 + 611572900 = 35752^2 + 24730^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1889778404.

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, 6384239 + ... + 6384534.

It is an arithmetic number, because the mean of its divisors is an integer number (283041157).

Almost surely, 2^1889778404 is an apocalyptic number.

It is an amenable number.

1889778404 is a deficient number, since it is larger than the sum of its proper divisors (1506715480).

1889778404 is a wasteful number, since it uses less digits than its factorization.

1889778404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12768814 (or 12768812 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 56.

The square root of 1889778404 is about 43471.5815677323. The cubic root of 1889778404 is about 1236.3372674012.

The spelling of 1889778404 in words is "one billion, eight hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred four".