15555243 has 16 divisors (see below), whose sum is σ = 23817600. Its totient is φ = 8930880.

The previous prime is 15555229. The next prime is 15555247. The reversal of 15555243 is 34255551.

It is a happy number.

It is not a de Polignac number, because 15555243 - 2⁴ = 15555227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15555243.

It is not an unprimeable number, because it can be changed into a prime (15555247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11778 + ... + 13031.

It is an arithmetic number, because the mean of its divisors is an integer number (1488600).

Almost surely, 2^15555243 is an apocalyptic number.

15555243 is a deficient number, since it is larger than the sum of its proper divisors (8262357).

15555243 is a wasteful number, since it uses less digits than its factorization.

15555243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24842.

The product of its digits is 15000, while the sum is 30.

The square root of 15555243 is about 3944.0135648854. The cubic root of 15555243 is about 249.6274076423.

The spelling of 15555243 in words is "fifteen million, five hundred fifty-five thousand, two hundred forty-three".