15542243 has 4 divisors (see below), whose sum is σ = 15623808. Its totient is φ = 15460680.

The previous prime is 15542207. The next prime is 15542269. The reversal of 15542243 is 34224551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 15542243 - 2⁸ = 15541987 is a prime.

It is a super-2 number, since 2×15542243² = 483122634942098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15542203) 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, 40496 + ... + 40877.

It is an arithmetic number, because the mean of its divisors is an integer number (3905952).

Almost surely, 2^15542243 is an apocalyptic number.

15542243 is a deficient number, since it is larger than the sum of its proper divisors (81565).

15542243 is an equidigital number, since it uses as much as digits as its factorization.

15542243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81564.

The product of its digits is 4800, while the sum is 26.

The square root of 15542243 is about 3942.3651530522. The cubic root of 15542243 is about 249.5578478001.

Adding to 15542243 its reverse (34224551), we get a palindrome (49766794).

The spelling of 15542243 in words is "fifteen million, five hundred forty-two thousand, two hundred forty-three".