1816693138 has 16 divisors (see below), whose sum is σ = 2947827456. Its totient is φ = 834711120.

The previous prime is 1816693103. The next prime is 1816693163. The reversal of 1816693138 is 8313966181.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150868 + ... + 162463.

It is an arithmetic number, because the mean of its divisors is an integer number (184239216).

Almost surely, 2^1816693138 is an apocalyptic number.

1816693138 is a deficient number, since it is larger than the sum of its proper divisors (1131134318).

1816693138 is a wasteful number, since it uses less digits than its factorization.

1816693138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313569.

The product of its digits is 186624, while the sum is 46.

The square root of 1816693138 is about 42622.6833739970. The cubic root of 1816693138 is about 1220.1892427928.

The spelling of 1816693138 in words is "one billion, eight hundred sixteen million, six hundred ninety-three thousand, one hundred thirty-eight".