140528393409 has 4 divisors (see below), whose sum is σ = 187371191216. Its totient is φ = 93685595604.

The previous prime is 140528393387. The next prime is 140528393477. The reversal of 140528393409 is 904393825041.

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.

It is not a de Polignac number, because 140528393409 - 2⁷ = 140528393281 is a prime.

It is a super-2 number, since 2×140528393409² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140528393209) 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, 23421398899 + ... + 23421398904.

It is an arithmetic number, because the mean of its divisors is an integer number (46842797804).

Almost surely, 2^140528393409 is an apocalyptic number.

It is an amenable number.

140528393409 is a deficient number, since it is larger than the sum of its proper divisors (46842797807).

140528393409 is an equidigital number, since it uses as much as digits as its factorization.

140528393409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46842797806.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 140528393409 in words is "one hundred forty billion, five hundred twenty-eight million, three hundred ninety-three thousand, four hundred nine".