140597909 has 4 divisors (see below), whose sum is σ = 140758380. Its totient is φ = 140437440.

The previous prime is 140597867. The next prime is 140597921. The reversal of 140597909 is 909795041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909795041 = 2693 ⋅337837.

It can be written as a sum of positive squares in 2 ways, for example, as 12229009 + 128368900 = 3497^2 + 11330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140597909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140597909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140597999) 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, 78914 + ... + 80675.

It is an arithmetic number, because the mean of its divisors is an integer number (35189595).

Almost surely, 2^140597909 is an apocalyptic number.

It is an amenable number.

140597909 is a deficient number, since it is larger than the sum of its proper divisors (160471).

140597909 is an equidigital number, since it uses as much as digits as its factorization.

140597909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160470.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 140597909 is about 11857.3989137584. The cubic root of 140597909 is about 519.9875601067.

The spelling of 140597909 in words is "one hundred forty million, five hundred ninety-seven thousand, nine hundred nine".