1918439093 has 2 divisors, whose sum is σ = 1918439094. Its totient is φ = 1918439092.

The previous prime is 1918439087. The next prime is 1918439113. The reversal of 1918439093 is 3909348191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1831240849 + 87198244 = 42793^2 + 9338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918439093 - 2²⁸ = 1650003637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918439893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959219546 + 959219547.

It is an arithmetic number, because the mean of its divisors is an integer number (959219547).

Almost surely, 2^1918439093 is an apocalyptic number.

It is an amenable number.

1918439093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918439093 is an equidigital number, since it uses as much as digits as its factorization.

1918439093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1918439093 is about 43799.9896461175. The cubic root of 1918439093 is about 1242.5560984999.

The spelling of 1918439093 in words is "one billion, nine hundred eighteen million, four hundred thirty-nine thousand, ninety-three".