15402242 has 8 divisors (see below), whose sum is σ = 23341836. Its totient is φ = 7621632.

The previous prime is 15402241. The next prime is 15402253. The reversal of 15402242 is 24220451.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15358561 + 43681 = 3919^2 + 209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (15402241) 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, 39503 + ... + 39890.

Almost surely, 2^15402242 is an apocalyptic number.

15402242 is a deficient number, since it is larger than the sum of its proper divisors (7939594).

15402242 is an equidigital number, since it uses as much as digits as its factorization.

15402242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79492.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15402242 is about 3924.5690209245. The cubic root of 15402242 is about 248.8062664061.

Adding to 15402242 its reverse (24220451), we get a palindrome (39622693).

The spelling of 15402242 in words is "fifteen million, four hundred two thousand, two hundred forty-two".