15138247 has 4 divisors (see below), whose sum is σ = 15277240. Its totient is φ = 14999256.

The previous prime is 15138241. The next prime is 15138259. The reversal of 15138247 is 74283151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15138247 - 2³ = 15138239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15138241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69333 + ... + 69550.

It is an arithmetic number, because the mean of its divisors is an integer number (3819310).

Almost surely, 2^15138247 is an apocalyptic number.

15138247 is a deficient number, since it is larger than the sum of its proper divisors (138993).

15138247 is a wasteful number, since it uses less digits than its factorization.

15138247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138992.

The product of its digits is 6720, while the sum is 31.

The square root of 15138247 is about 3890.7900226047. The cubic root of 15138247 is about 247.3765503456.

The spelling of 15138247 in words is "fifteen million, one hundred thirty-eight thousand, two hundred forty-seven".