140391 has 12 divisors (see below), whose sum is σ = 213720. Its totient is φ = 88560.

The previous prime is 140381. The next prime is 140401. The reversal of 140391 is 193041.

140391 = 26³ + 27³ + ... + 31³.

It is an interprime number because it is at equal distance from previous prime (140381) and next prime (140401).

It is not a de Polignac number, because 140391 - 2⁷ = 140263 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 140391.

It is not an unprimeable number, because it can be changed into a prime (140321) 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, 240 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (17810).

2¹⁴⁰³⁹¹ is an apocalyptic number.

140391 is a deficient number, since it is larger than the sum of its proper divisors (73329).

140391 is a wasteful number, since it uses less digits than its factorization.

140391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 843 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 140391 is about 374.6878700999. The cubic root of 140391 is about 51.9732357338.

Subtracting 140391 from its reverse (193041), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 140391 in words is "one hundred forty thousand, three hundred ninety-one".