15428121 has 8 divisors (see below), whose sum is σ = 20608224. Its totient is φ = 10266720.

The previous prime is 15428107. The next prime is 15428131. The reversal of 15428121 is 12182451.

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

It is not a de Polignac number, because 15428121 - 2²¹ = 13330969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15428091 and 15428100.

It is not an unprimeable number, because it can be changed into a prime (15428131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2620 + ... + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (2576028).

Almost surely, 2^15428121 is an apocalyptic number.

It is an amenable number.

15428121 is a deficient number, since it is larger than the sum of its proper divisors (5180103).

15428121 is an equidigital number, since it uses as much as digits as its factorization.

15428121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351.

The product of its digits is 640, while the sum is 24.

The square root of 15428121 is about 3927.8646870787. The cubic root of 15428121 is about 248.9455373538.

The spelling of 15428121 in words is "fifteen million, four hundred twenty-eight thousand, one hundred twenty-one".