140323209 has 16 divisors (see below), whose sum is σ = 202968192. Its totient is φ = 85719168.

The previous prime is 140323123. The next prime is 140323217. The reversal of 140323209 is 902323041.

It is not a de Polignac number, because 140323209 - 2⁸ = 140322953 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140323289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7789 + ... + 18474.

It is an arithmetic number, because the mean of its divisors is an integer number (12685512).

Almost surely, 2^140323209 is an apocalyptic number.

It is an amenable number.

140323209 is a deficient number, since it is larger than the sum of its proper divisors (62644983).

140323209 is a wasteful number, since it uses less digits than its factorization.

140323209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26416.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 140323209 is about 11845.8097654825. The cubic root of 140323209 is about 519.6486889905.

The spelling of 140323209 in words is "one hundred forty million, three hundred twenty-three thousand, two hundred nine".