140431506 has 16 divisors (see below), whose sum is σ = 284419200. Its totient is φ = 46217808.

The previous prime is 140431481. The next prime is 140431513. The reversal of 140431506 is 605134041.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147661 + ... + 148608.

It is an arithmetic number, because the mean of its divisors is an integer number (17776200).

Almost surely, 2^140431506 is an apocalyptic number.

140431506 is an abundant number, since it is smaller than the sum of its proper divisors (143987694).

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

140431506 is a wasteful number, since it uses less digits than its factorization.

140431506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296353.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 140431506 is about 11850.3799939074. The cubic root of 140431506 is about 519.7823374041.

Adding to 140431506 its reverse (605134041), we get a palindrome (745565547).

The spelling of 140431506 in words is "one hundred forty million, four hundred thirty-one thousand, five hundred six".