15421242 has 8 divisors (see below), whose sum is σ = 30842496. Its totient is φ = 5140412.

The previous prime is 15421213. The next prime is 15421249. The reversal of 15421242 is 24212451.

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

15421242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (15421249) 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, 1285098 + ... + 1285109.

It is an arithmetic number, because the mean of its divisors is an integer number (3855312).

Almost surely, 2^15421242 is an apocalyptic number.

15421242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15421242 is a wasteful number, since it uses less digits than its factorization.

15421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570212.

The product of its digits is 640, while the sum is 21.

The square root of 15421242 is about 3926.9889228262. The cubic root of 15421242 is about 248.9085323953.

Adding to 15421242 its reverse (24212451), we get a palindrome (39633693).

The spelling of 15421242 in words is "fifteen million, four hundred twenty-one thousand, two hundred forty-two".