140815409 has 4 divisors (see below), whose sum is σ = 160931904. Its totient is φ = 120698916.

The previous prime is 140815399. The next prime is 140815417. The reversal of 140815409 is 904518041.

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: 904518041 = 7 ⋅129216863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140815409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140815429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10058237 + ... + 10058250.

It is an arithmetic number, because the mean of its divisors is an integer number (40232976).

Almost surely, 2^140815409 is an apocalyptic number.

It is an amenable number.

140815409 is a deficient number, since it is larger than the sum of its proper divisors (20116495).

140815409 is an equidigital number, since it uses as much as digits as its factorization.

140815409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20116494.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 140815409 is about 11866.5668581945. The cubic root of 140815409 is about 520.2555560915.

The spelling of 140815409 in words is "one hundred forty million, eight hundred fifteen thousand, four hundred nine".