140209709 has 8 divisors (see below), whose sum is σ = 144170880. Its totient is φ = 136274400.

The previous prime is 140209673. The next prime is 140209723. The reversal of 140209709 is 907902041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140209709 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 (140209739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4802 + ... + 17420.

It is an arithmetic number, because the mean of its divisors is an integer number (18021360).

Almost surely, 2^140209709 is an apocalyptic number.

It is an amenable number.

140209709 is a deficient number, since it is larger than the sum of its proper divisors (3961171).

140209709 is a wasteful number, since it uses less digits than its factorization.

140209709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12931.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 140209709 is about 11841.0180727841. The cubic root of 140209709 is about 519.5085457793.

The spelling of 140209709 in words is "one hundred forty million, two hundred nine thousand, seven hundred nine".