1918801772 has 12 divisors (see below), whose sum is σ = 3503899056. Its totient is φ = 917687760.

The previous prime is 1918801769. The next prime is 1918801793. The reversal of 1918801772 is 2771088191.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10428179 + ... + 10428362.

It is an arithmetic number, because the mean of its divisors is an integer number (291991588).

Almost surely, 2^1918801772 is an apocalyptic number.

It is an amenable number.

1918801772 is a deficient number, since it is larger than the sum of its proper divisors (1585097284).

1918801772 is a wasteful number, since it uses less digits than its factorization.

1918801772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20856568 (or 20856566 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1918801772 is about 43804.1296226737. The cubic root of 1918801772 is about 1242.6343948971.

The spelling of 1918801772 in words is "one billion, nine hundred eighteen million, eight hundred one thousand, seven hundred seventy-two".