140239999 has 4 divisors (see below), whose sum is σ = 140295064. Its totient is φ = 140184936.

The previous prime is 140239997. The next prime is 140240011. The reversal of 140239999 is 999932041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 140239999 - 2¹ = 140239997 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 (140239997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23517 + ... + 28870.

It is an arithmetic number, because the mean of its divisors is an integer number (35073766).

Almost surely, 2^140239999 is an apocalyptic number.

140239999 is a deficient number, since it is larger than the sum of its proper divisors (55065).

140239999 is an equidigital number, since it uses as much as digits as its factorization.

140239999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55064.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 140239999 is about 11842.2970322484. The cubic root of 140239999 is about 519.5459535094.

The spelling of 140239999 in words is "one hundred forty million, two hundred thirty-nine thousand, nine hundred ninety-nine".