15223530 has 32 divisors (see below), whose sum is σ = 41756544. Its totient is φ = 3479616.

The previous prime is 15223501. The next prime is 15223531. The reversal of 15223530 is 3532251.

15223530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 15223497 and 15223506.

It is not an unprimeable number, because it can be changed into a prime (15223531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36037 + ... + 36456.

It is an arithmetic number, because the mean of its divisors is an integer number (1304892).

Almost surely, 2^15223530 is an apocalyptic number.

15223530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15223530 is an abundant number, since it is smaller than the sum of its proper divisors (26533014).

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

15223530 is a wasteful number, since it uses less digits than its factorization.

15223530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72510.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 15223530 is about 3901.7342298009. The cubic root of 15223530 is about 247.8402218309.

Adding to 15223530 its reverse (3532251), we get a palindrome (18755781).

It can be divided in two parts, 15223 and 530, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 15223530 in words is "fifteen million, two hundred twenty-three thousand, five hundred thirty".