140020431 has 4 divisors (see below), whose sum is σ = 186693912. Its totient is φ = 93346952.

The previous prime is 140020429. The next prime is 140020451. The reversal of 140020431 is 134020041.

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 140020431 - 2¹ = 140020429 is a prime.

It is a super-2 number, since 2×140020431² = 39211442194851522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 140020431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140020451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23336736 + ... + 23336741.

It is an arithmetic number, because the mean of its divisors is an integer number (46673478).

Almost surely, 2^140020431 is an apocalyptic number.

140020431 is a deficient number, since it is larger than the sum of its proper divisors (46673481).

140020431 is an equidigital number, since it uses as much as digits as its factorization.

140020431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46673480.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 140020431 is about 11833.0229020314. The cubic root of 140020431 is about 519.2746679677.

Adding to 140020431 its reverse (134020041), we get a palindrome (274040472).

The spelling of 140020431 in words is "one hundred forty million, twenty thousand, four hundred thirty-one".