1918157922 has 126 divisors (see below), whose sum is σ = 4581258129. Its totient is φ = 602037360.

The previous prime is 1918157921. The next prime is 1918157929. The reversal of 1918157922 is 2297518191.

It can be written as a sum of positive squares in 2 ways, for example, as 1547556921 + 370601001 = 39339^2 + 19251^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30969.

It is not an unprimeable number, because it can be changed into a prime (1918157921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 51842088 + ... + 51842124.

Almost surely, 2^1918157922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918157922

1918157922 is an abundant number, since it is smaller than the sum of its proper divisors (2663100207).

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

1918157922 is an frugal number, since it uses more digits than its factorization.

1918157922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 73 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 1918157922 is about 43796.7798131324. The cubic root of 1918157922 is about 1242.4953915408.

The spelling of 1918157922 in words is "one billion, nine hundred eighteen million, one hundred fifty-seven thousand, nine hundred twenty-two".