168138783 has 12 divisors (see below), whose sum is σ = 246195040. Its totient is φ = 110556576.

The previous prime is 168138779. The next prime is 168138791. The reversal of 168138783 is 387831861.

It is not a de Polignac number, because 168138783 - 2² = 168138779 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168131783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127303 + ... + 128616.

Almost surely, 2^168138783 is an apocalyptic number.

168138783 is a deficient number, since it is larger than the sum of its proper divisors (78056257).

168138783 is a wasteful number, since it uses less digits than its factorization.

168138783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255998 (or 255995 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 168138783 is about 12966.8339620742. The cubic root of 168138783 is about 551.9367346366.

It can be divided in two parts, 168138 and 783, that added together give a square (168921 = 411²).

The spelling of 168138783 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, seven hundred eighty-three".