140605218 has 24 divisors (see below), whose sum is σ = 328079388. Its totient is φ = 43263072.

The previous prime is 140605211. The next prime is 140605219. The reversal of 140605218 is 812506041.

140605218 is a `hidden beast` number, since 1 + 40 + 605 + 2 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138933369 + 1671849 = 11787^2 + 1293^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 140605191 and 140605200.

It is not an unprimeable number, because it can be changed into a prime (140605211) 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, 300205 + ... + 300672.

Almost surely, 2^140605218 is an apocalyptic number.

140605218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

140605218 is an abundant number, since it is smaller than the sum of its proper divisors (187474170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140605218 is a wasteful number, since it uses less digits than its factorization.

140605218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600898 (or 600895 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 140605218 is about 11857.7071139407. The cubic root of 140605218 is about 519.9965704902.

The spelling of 140605218 in words is "one hundred forty million, six hundred five thousand, two hundred eighteen".