140239987 has 4 divisors (see below), whose sum is σ = 148489416. Its totient is φ = 131990560.

The previous prime is 140239973. The next prime is 140239997. The reversal of 140239987 is 789932041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789932041 = 577 ⋅1369033.

It is a cyclic number.

It is not a de Polignac number, because 140239987 - 2⁷ = 140239859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140239907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4124689 + ... + 4124722.

It is an arithmetic number, because the mean of its divisors is an integer number (37122354).

Almost surely, 2^140239987 is an apocalyptic number.

140239987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

140239987 is a deficient number, since it is larger than the sum of its proper divisors (8249429).

140239987 is an equidigital number, since it uses as much as digits as its factorization.

140239987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8249428.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 140239987 is about 11842.2965255900. The cubic root of 140239987 is about 519.5459386906.

The spelling of 140239987 in words is "one hundred forty million, two hundred thirty-nine thousand, nine hundred eighty-seven".