16509242 has 12 divisors (see below), whose sum is σ = 25123950. Its totient is φ = 8136288.

The previous prime is 16509221. The next prime is 16509247. The reversal of 16509242 is 24290561.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13920361 + 2588881 = 3731^2 + 1609^2 .

It is not an unprimeable number, because it can be changed into a prime (16509247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9884 + ... + 11432.

Almost surely, 2^16509242 is an apocalyptic number.

16509242 is a deficient number, since it is larger than the sum of its proper divisors (8614708).

16509242 is an equidigital number, since it uses as much as digits as its factorization.

16509242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16509242 is about 4063.1566546221. The cubic root of 16509242 is about 254.6296919021.

The spelling of 16509242 in words is "sixteen million, five hundred nine thousand, two hundred forty-two".