16140309 has 4 divisors (see below), whose sum is σ = 21520416. Its totient is φ = 10760204.

The previous prime is 16140307. The next prime is 16140337. The reversal of 16140309 is 90304161.

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 16140309 - 2¹ = 16140307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16140307) 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, 2690049 + ... + 2690054.

It is an arithmetic number, because the mean of its divisors is an integer number (5380104).

Almost surely, 2^16140309 is an apocalyptic number.

It is an amenable number.

16140309 is a deficient number, since it is larger than the sum of its proper divisors (5380107).

16140309 is an equidigital number, since it uses as much as digits as its factorization.

16140309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380106.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16140309 is about 4017.5003422526. The cubic root of 16140309 is about 252.7186434130.

It can be divided in two parts, 161 and 40309, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 16140309 in words is "sixteen million, one hundred forty thousand, three hundred nine".