15242399 has 4 divisors (see below), whose sum is σ = 15905136. Its totient is φ = 14579664.

The previous prime is 15242329. The next prime is 15242401. The reversal of 15242399 is 99324251.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15242399 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 (15242309) 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, 331334 + ... + 331379.

It is an arithmetic number, because the mean of its divisors is an integer number (3976284).

Almost surely, 2^15242399 is an apocalyptic number.

15242399 is a deficient number, since it is larger than the sum of its proper divisors (662737).

15242399 is an equidigital number, since it uses as much as digits as its factorization.

15242399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662736.

The product of its digits is 19440, while the sum is 35.

The square root of 15242399 is about 3904.1515083306. The cubic root of 15242399 is about 247.9425758044.

The spelling of 15242399 in words is "fifteen million, two hundred forty-two thousand, three hundred ninety-nine".