168036381 has 24 divisors (see below), whose sum is σ = 257572224. Its totient is φ = 105198720.

The previous prime is 168036373. The next prime is 168036383. The reversal of 168036381 is 183630861.

168036381 is a `hidden beast` number, since 16 + 8 + 0 + 3 + 638 + 1 = 666.

It is not a de Polignac number, because 168036381 - 2³ = 168036373 is a prime.

It is a super-2 number, since 2×168036381² = 56472450679154322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168036383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88876 + ... + 90746.

It is an arithmetic number, because the mean of its divisors is an integer number (10732176).

Almost surely, 2^168036381 is an apocalyptic number.

It is an amenable number.

168036381 is a deficient number, since it is larger than the sum of its proper divisors (89535843).

168036381 is a wasteful number, since it uses less digits than its factorization.

168036381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 168036381 is about 12962.8847483884. The cubic root of 168036381 is about 551.8246627270.

The spelling of 168036381 in words is "one hundred sixty-eight million, thirty-six thousand, three hundred eighty-one".