1816117928 has 16 divisors (see below), whose sum is σ = 3469471380. Its totient is φ = 890925568.

The previous prime is 1816117909. The next prime is 1816117931. The reversal of 1816117928 is 8297116181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1709160964 + 106956964 = 41342^2 + 10342^2 .

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, 2141225 + ... + 2142072.

Almost surely, 2^1816117928 is an apocalyptic number.

It is an amenable number.

1816117928 is a deficient number, since it is larger than the sum of its proper divisors (1653353452).

1816117928 is a wasteful number, since it uses less digits than its factorization.

1816117928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283356 (or 4283352 counting only the distinct ones).

The product of its digits is 48384, while the sum is 44.

The square root of 1816117928 is about 42615.9351416815. The cubic root of 1816117928 is about 1220.0604484964.

The spelling of 1816117928 in words is "one billion, eight hundred sixteen million, one hundred seventeen thousand, nine hundred twenty-eight".