15228947 has 4 divisors (see below), whose sum is σ = 15236760. Its totient is φ = 15221136.

The previous prime is 15228943. The next prime is 15228953. The reversal of 15228947 is 74982251.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74982251 = 569 ⋅131779.

It is a cyclic number.

It is not a de Polignac number, because 15228947 - 2² = 15228943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15228947.

It is not an unprimeable number, because it can be changed into a prime (15228943) 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, 1703 + ... + 5775.

It is an arithmetic number, because the mean of its divisors is an integer number (3809190).

Almost surely, 2^15228947 is an apocalyptic number.

15228947 is a deficient number, since it is larger than the sum of its proper divisors (7813).

15228947 is an equidigital number, since it uses as much as digits as its factorization.

15228947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7812.

The product of its digits is 40320, while the sum is 38.

The square root of 15228947 is about 3902.4283465555. The cubic root of 15228947 is about 247.8696147350.

The spelling of 15228947 in words is "fifteen million, two hundred twenty-eight thousand, nine hundred forty-seven".