140243240 has 32 divisors (see below), whose sum is σ = 315895680. Its totient is φ = 56035392.

The previous prime is 140243239. The next prime is 140243291. The reversal of 140243240 is 42342041.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56669 + ... + 59091.

It is an arithmetic number, because the mean of its divisors is an integer number (9871740).

Almost surely, 2^140243240 is an apocalyptic number.

140243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140243240 is an abundant number, since it is smaller than the sum of its proper divisors (175652440).

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

140243240 is a wasteful number, since it uses less digits than its factorization.

140243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881 (or 3877 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 140243240 is about 11842.4338714641. The cubic root of 140243240 is about 519.5499557804.

Adding to 140243240 its reverse (42342041), we get a palindrome (182585281).

The spelling of 140243240 in words is "one hundred forty million, two hundred forty-three thousand, two hundred forty".