1918128938 has 32 divisors (see below), whose sum is σ = 3394130688. Its totient is φ = 803123200.

The previous prime is 1918128931. The next prime is 1918128959. The reversal of 1918128938 is 8398218191.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1918128931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36983 + ... + 72138.

It is an arithmetic number, because the mean of its divisors is an integer number (106066584).

Almost surely, 2^1918128938 is an apocalyptic number.

1918128938 is a deficient number, since it is larger than the sum of its proper divisors (1476001750).

1918128938 is a wasteful number, since it uses less digits than its factorization.

1918128938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109198.

The product of its digits is 248832, while the sum is 50.

The square root of 1918128938 is about 43796.4489199752. The cubic root of 1918128938 is about 1242.4891333373.

The spelling of 1918128938 in words is "one billion, nine hundred eighteen million, one hundred twenty-eight thousand, nine hundred thirty-eight".