23172136 has 32 divisors (see below), whose sum is σ = 47292840. Its totient is φ = 10579968.

The previous prime is 23172133. The next prime is 23172137. The reversal of 23172136 is 63127132.

It can be written as a sum of positive squares in 4 ways, for example, as 15163236 + 8008900 = 3894^2 + 2830^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 23172136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8940 + ... + 11236.

Almost surely, 2^23172136 is an apocalyptic number.

23172136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23172136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23646420).

23172136 is an abundant number, since it is smaller than the sum of its proper divisors (24120704).

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

23172136 is a wasteful number, since it uses less digits than its factorization.

23172136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413 (or 2409 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 23172136 is about 4813.7444884414. The cubic root of 23172136 is about 285.0944018863.

Adding to 23172136 its reverse (63127132), we get a palindrome (86299268).

The spelling of 23172136 in words is "twenty-three million, one hundred seventy-two thousand, one hundred thirty-six".