140865381 has 12 divisors (see below), whose sum is σ = 208435500. Its totient is φ = 91619520.

The previous prime is 140865379. The next prime is 140865397. The reversal of 140865381 is 183568041.

140865381 is a `hidden beast` number, since 1 + 40 + 86 + 538 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3272481 + 137592900 = 1809^2 + 11730^2 .

It is not a de Polignac number, because 140865381 - 2¹ = 140865379 is a prime.

It is a super-2 number, since 2×140865381² = 39686111128550322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140865301) 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, 190506 + ... + 191243.

It is an arithmetic number, because the mean of its divisors is an integer number (17369625).

Almost surely, 2^140865381 is an apocalyptic number.

It is an amenable number.

140865381 is a deficient number, since it is larger than the sum of its proper divisors (67570119).

140865381 is a wasteful number, since it uses less digits than its factorization.

140865381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381796 (or 381793 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 140865381 is about 11868.6722509302. The cubic root of 140865381 is about 520.3170908720.

It can be divided in two parts, 140865 and 381, that added together give a triangular number (141246 = T₅₃₁).

The spelling of 140865381 in words is "one hundred forty million, eight hundred sixty-five thousand, three hundred eighty-one".