1894388889572 has 6 divisors (see below), whose sum is σ = 3315180556758. Its totient is φ = 947194444784.

The previous prime is 1894388889541. The next prime is 1894388889637. The reversal of 1894388889572 is 2759888834981.

It can be written as a sum of positive squares in only one way, i.e., 1048915995556 + 845472894016 = 1024166^2 + 919496^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236798611193 + ... + 236798611200.

It is an arithmetic number, because the mean of its divisors is an integer number (552530092793).

Almost surely, 2^{1894388889572} is an apocalyptic number.

It is an amenable number.

1894388889572 is a deficient number, since it is larger than the sum of its proper divisors (1420791667186).

1894388889572 is a wasteful number, since it uses less digits than its factorization.

1894388889572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473597222397 (or 473597222395 counting only the distinct ones).

The product of its digits is 2229534720, while the sum is 80.

The spelling of 1894388889572 in words is "one trillion, eight hundred ninety-four billion, three hundred eighty-eight million, eight hundred eighty-nine thousand, five hundred seventy-two".