1899857772 has 18 divisors (see below), whose sum is σ = 4802418348. Its totient is φ = 633285912.

The previous prime is 1899857767. The next prime is 1899857779. The reversal of 1899857772 is 2777589981.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1899857779) 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 5 ways as a sum of consecutive naturals, for example, 26386878 + ... + 26386949.

Almost surely, 2^1899857772 is an apocalyptic number.

1899857772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1899857772 is an abundant number, since it is smaller than the sum of its proper divisors (2902560576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1899857772 is a wasteful number, since it uses less digits than its factorization.

1899857772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52773837 (or 52773832 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The square root of 1899857772 is about 43587.3579378241. The cubic root of 1899857772 is about 1238.5314239041.

The spelling of 1899857772 in words is "one billion, eight hundred ninety-nine million, eight hundred fifty-seven thousand, seven hundred seventy-two".