1851906772 has 12 divisors (see below), whose sum is σ = 3241840000. Its totient is φ = 925666776.

The previous prime is 1851906769. The next prime is 1851906779. The reversal of 1851906772 is 2776091581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851906779) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 56772 + ... + 83227.

Almost surely, 2^1851906772 is an apocalyptic number.

It is an amenable number.

1851906772 is a deficient number, since it is larger than the sum of its proper divisors (1389933228).

1851906772 is a wasteful number, since it uses less digits than its factorization.

1851906772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143310 (or 143308 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 1851906772 is about 43033.7864009199. The cubic root of 1851906772 is about 1228.0226390801.

The spelling of 1851906772 in words is "one billion, eight hundred fifty-one million, nine hundred six thousand, seven hundred seventy-two".