1816042939 has 2 divisors, whose sum is σ = 1816042940. Its totient is φ = 1816042938.

The previous prime is 1816042919. The next prime is 1816043063. The reversal of 1816042939 is 9392406181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1816042939 - 2²⁵ = 1782488507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1816042895 and 1816042904.

It is not a weakly prime, because it can be changed into another prime (1816042919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908021469 + 908021470.

It is an arithmetic number, because the mean of its divisors is an integer number (908021470).

Almost surely, 2^1816042939 is an apocalyptic number.

1816042939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816042939 is an equidigital number, since it uses as much as digits as its factorization.

1816042939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1816042939 is about 42615.0553091275. The cubic root of 1816042939 is about 1220.0436558328.

The spelling of 1816042939 in words is "one billion, eight hundred sixteen million, forty-two thousand, nine hundred thirty-nine".