140239031 has 4 divisors (see below), whose sum is σ = 140263200. Its totient is φ = 140214864.

The previous prime is 140239013. The next prime is 140239079. The reversal of 140239031 is 130932041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130932041 = 211 ⋅620531.

It is a cyclic number.

It is not a de Polignac number, because 140239031 - 2¹⁸ = 139976887 is a prime.

It is a super-2 number, since 2×140239031² = 39333971631637922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140238988 and 140239006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140239531) 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, 2435 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (35065800).

Almost surely, 2^140239031 is an apocalyptic number.

140239031 is a deficient number, since it is larger than the sum of its proper divisors (24169).

140239031 is an equidigital number, since it uses as much as digits as its factorization.

140239031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24168.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 140239031 is about 11842.2561617286. The cubic root of 140239031 is about 519.5447581261.

The spelling of 140239031 in words is "one hundred forty million, two hundred thirty-nine thousand, thirty-one".