1618861892 has 24 divisors (see below), whose sum is σ = 2891402136. Its totient is φ = 792799488.

The previous prime is 1618861889. The next prime is 1618861939. The reversal of 1618861892 is 2981688161.

It can be written as a sum of positive squares in 4 ways, for example, as 159163456 + 1459698436 = 12616^2 + 38206^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1618861892.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123728 + ... + 136184.

It is an arithmetic number, because the mean of its divisors is an integer number (120475089).

Almost surely, 2^1618861892 is an apocalyptic number.

It is an amenable number.

1618861892 is a deficient number, since it is larger than the sum of its proper divisors (1272540244).

1618861892 is a wasteful number, since it uses less digits than its factorization.

1618861892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13127 (or 13125 counting only the distinct ones).

The product of its digits is 331776, while the sum is 50.

The square root of 1618861892 is about 40235.0828506665. The cubic root of 1618861892 is about 1174.1851944506.

The spelling of 1618861892 in words is "one billion, six hundred eighteen million, eight hundred sixty-one thousand, eight hundred ninety-two".