15140809 has 4 divisors (see below), whose sum is σ = 15290820. Its totient is φ = 14990800.

The previous prime is 15140789. The next prime is 15140833. The reversal of 15140809 is 90804151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90804151 = 101 ⋅899051.

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 6110784 = 3005^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 15140809 - 2¹⁷ = 15009737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15140869) 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, 74854 + ... + 75055.

It is an arithmetic number, because the mean of its divisors is an integer number (3822705).

Almost surely, 2^15140809 is an apocalyptic number.

It is an amenable number.

15140809 is a deficient number, since it is larger than the sum of its proper divisors (150011).

15140809 is a wasteful number, since it uses less digits than its factorization.

15140809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150010.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 15140809 is about 3891.1192477229. The cubic root of 15140809 is about 247.3905049109.

The spelling of 15140809 in words is "fifteen million, one hundred forty thousand, eight hundred nine".