15780242 has 8 divisors (see below), whose sum is σ = 24023856. Its totient is φ = 7772292.

The previous prime is 15780239. The next prime is 15780283. The reversal of 15780242 is 24208751.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58748 + ... + 59015.

It is an arithmetic number, because the mean of its divisors is an integer number (3002982).

Almost surely, 2^15780242 is an apocalyptic number.

15780242 is a deficient number, since it is larger than the sum of its proper divisors (8243614).

15780242 is a wasteful number, since it uses less digits than its factorization.

15780242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117832.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 15780242 is about 3972.4352732298. The cubic root of 15780242 is about 250.8252303158.

Adding to 15780242 its reverse (24208751), we get a palindrome (39988993).

The spelling of 15780242 in words is "fifteen million, seven hundred eighty thousand, two hundred forty-two".