140405521 has 4 divisors (see below), whose sum is σ = 140450544. Its totient is φ = 140360500.

The previous prime is 140405513. The next prime is 140405527. The reversal of 140405521 is 125504041.

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 a cyclic number.

It is not a de Polignac number, because 140405521 - 2³ = 140405513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140405492 and 140405501.

It is not an unprimeable number, because it can be changed into a prime (140405527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17455 + ... + 24196.

It is an arithmetic number, because the mean of its divisors is an integer number (35112636).

Almost surely, 2^140405521 is an apocalyptic number.

It is an amenable number.

140405521 is a deficient number, since it is larger than the sum of its proper divisors (45023).

140405521 is an equidigital number, since it uses as much as digits as its factorization.

140405521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45022.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 140405521 is about 11849.2835648405. The cubic root of 140405521 is about 519.7502758020.

Adding to 140405521 its reverse (125504041), we get a palindrome (265909562).

The spelling of 140405521 in words is "one hundred forty million, four hundred five thousand, five hundred twenty-one".