140204409 has 4 divisors (see below), whose sum is σ = 186939216. Its totient is φ = 93469604.

The previous prime is 140204399. The next prime is 140204429. The reversal of 140204409 is 904402041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904402041 = 3 ⋅301467347.

It is a cyclic number.

It is not a de Polignac number, because 140204409 - 2⁵ = 140204377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140204429) 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, 23367399 + ... + 23367404.

It is an arithmetic number, because the mean of its divisors is an integer number (46734804).

Almost surely, 2^140204409 is an apocalyptic number.

It is an amenable number.

140204409 is a deficient number, since it is larger than the sum of its proper divisors (46734807).

140204409 is an equidigital number, since it uses as much as digits as its factorization.

140204409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46734806.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 140204409 is about 11840.7942723451. The cubic root of 140204409 is about 519.5019997990.

The spelling of 140204409 in words is "one hundred forty million, two hundred four thousand, four hundred nine".