15438243 has 8 divisors (see below), whose sum is σ = 20638800. Its totient is φ = 10264928.

The previous prime is 15438233. The next prime is 15438251. The reversal of 15438243 is 34283451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15438243 - 2⁸ = 15437987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15438243.

It is not an unprimeable number, because it can be changed into a prime (15438233) 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 7 ways as a sum of consecutive naturals, for example, 5448 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (2579850).

Almost surely, 2^15438243 is an apocalyptic number.

15438243 is a deficient number, since it is larger than the sum of its proper divisors (5200557).

15438243 is a wasteful number, since it uses less digits than its factorization.

15438243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13621.

The product of its digits is 11520, while the sum is 30.

The square root of 15438243 is about 3929.1529621535. The cubic root of 15438243 is about 248.9999677425. Note that the first 4 decimals are identical.

The spelling of 15438243 in words is "fifteen million, four hundred thirty-eight thousand, two hundred forty-three".