1806390772 has 12 divisors (see below), whose sum is σ = 3182400900. Its totient is φ = 897133376.

The previous prime is 1806390769. The next prime is 1806390841. The reversal of 1806390772 is 2770936081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1081488996 + 724901776 = 32886^2 + 26924^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514833 + ... + 1516024.

It is an arithmetic number, because the mean of its divisors is an integer number (265200075).

Almost surely, 2^1806390772 is an apocalyptic number.

It is an amenable number.

1806390772 is a deficient number, since it is larger than the sum of its proper divisors (1376010128).

1806390772 is a wasteful number, since it uses less digits than its factorization.

1806390772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031010 (or 3031008 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 1806390772 is about 42501.6561089095. The cubic root of 1806390772 is about 1217.8783270795.

The spelling of 1806390772 in words is "one billion, eight hundred six million, three hundred ninety thousand, seven hundred seventy-two".