16231530 has 64 divisors (see below), whose sum is σ = 45745920. Its totient is φ = 3608064.

The previous prime is 16231513. The next prime is 16231543. The reversal of 16231530 is 3513261.

It is a super-2 number, since 2×16231530² = 526925132281800, which contains 22 as substring.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16231497 and 16231506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6726 + ... + 8814.

It is an arithmetic number, because the mean of its divisors is an integer number (714780).

Almost surely, 2^16231530 is an apocalyptic number.

16231530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16231530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22872960).

16231530 is an abundant number, since it is smaller than the sum of its proper divisors (29514390).

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

16231530 is a wasteful number, since it uses less digits than its factorization.

16231530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 16231530 is about 4028.8373012570. The cubic root of 16231530 is about 253.1938501934.

Adding to 16231530 its reverse (3513261), we get a palindrome (19744791).

It can be divided in two parts, 16231 and 530, that added together give a palindrome (16761).

The spelling of 16231530 in words is "sixteen million, two hundred thirty-one thousand, five hundred thirty".