140806321 has 4 divisors (see below), whose sum is σ = 148217200. Its totient is φ = 133395444.

The previous prime is 140806307. The next prime is 140806333. The reversal of 140806321 is 123608041.

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 140806321 - 2⁹ = 140805809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140806301) 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, 3705411 + ... + 3705448.

It is an arithmetic number, because the mean of its divisors is an integer number (37054300).

Almost surely, 2^140806321 is an apocalyptic number.

It is an amenable number.

140806321 is a deficient number, since it is larger than the sum of its proper divisors (7410879).

140806321 is an equidigital number, since it uses as much as digits as its factorization.

140806321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410878.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 140806321 is about 11866.1839274469. The cubic root of 140806321 is about 520.2443636984.

The spelling of 140806321 in words is "one hundred forty million, eight hundred six thousand, three hundred twenty-one".