140723509 has 4 divisors (see below), whose sum is σ = 140952204. Its totient is φ = 140494816.

The previous prime is 140723503. The next prime is 140723537. The reversal of 140723509 is 905327041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2002225 + 138721284 = 1415^2 + 11778^2 .

It is a cyclic number.

It is not a de Polignac number, because 140723509 - 2⁷ = 140723381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140723503) 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, 113422 + ... + 114655.

It is an arithmetic number, because the mean of its divisors is an integer number (35238051).

Almost surely, 2^140723509 is an apocalyptic number.

It is an amenable number.

140723509 is a deficient number, since it is larger than the sum of its proper divisors (228695).

140723509 is an equidigital number, since it uses as much as digits as its factorization.

140723509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228694.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 140723509 is about 11862.6940026286. The cubic root of 140723509 is about 520.1423537775.

The spelling of 140723509 in words is "one hundred forty million, seven hundred twenty-three thousand, five hundred nine".