15500242 has 4 divisors (see below), whose sum is σ = 23250366. Its totient is φ = 7750120.

The previous prime is 15500237. The next prime is 15500263. The reversal of 15500242 is 24200551.

15500242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 219961 = 3909^2 + 469^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3875059 + ... + 3875062.

Almost surely, 2^15500242 is an apocalyptic number.

15500242 is a deficient number, since it is larger than the sum of its proper divisors (7750124).

15500242 is an equidigital number, since it uses as much as digits as its factorization.

15500242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7750123.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 15500242 is about 3937.0346709167. The cubic root of 15500242 is about 249.3328452016.

Adding to 15500242 its reverse (24200551), we get a palindrome (39700793).

The spelling of 15500242 in words is "fifteen million, five hundred thousand, two hundred forty-two".