15643243 has 32 divisors (see below), whose sum is σ = 20800512. Its totient is φ = 11499840.

The previous prime is 15643237. The next prime is 15643253. The reversal of 15643243 is 34234651.

It is not a de Polignac number, because 15643243 - 2⁵ = 15643211 is a prime.

It is a super-3 number, since 3×15643243³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15643223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 214255 + ... + 214327.

It is an arithmetic number, because the mean of its divisors is an integer number (650016).

Almost surely, 2^15643243 is an apocalyptic number.

15643243 is a deficient number, since it is larger than the sum of its proper divisors (5157269).

15643243 is an equidigital number, since it uses as much as digits as its factorization.

15643243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 114 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 15643243 is about 3955.1539793035. The cubic root of 15643243 is about 250.0972581585.

Adding to 15643243 its reverse (34234651), we get a palindrome (49877894).

The spelling of 15643243 in words is "fifteen million, six hundred forty-three thousand, two hundred forty-three".