15994428 has 96 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 4677120.

The previous prime is 15994423. The next prime is 15994477. The reversal of 15994428 is 82449951.

15994428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15994428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15994421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271063 + ... + 271121.

It is an arithmetic number, because the mean of its divisors is an integer number (441000).

Almost surely, 2^15994428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15994428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21168000).

15994428 is an abundant number, since it is smaller than the sum of its proper divisors (26341572).

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

15994428 is a wasteful number, since it uses less digits than its factorization.

15994428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 153 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 15994428 is about 3999.3034393504. The cubic root of 15994428 is about 251.9549554157.

The spelling of 15994428 in words is "fifteen million, nine hundred ninety-four thousand, four hundred twenty-eight".