23531403 has 8 divisors (see below), whose sum is σ = 35857408. Its totient is φ = 13446504.

The previous prime is 23531401. The next prime is 23531407. The reversal of 23531403 is 30413532.

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

It is not a de Polignac number, because 23531403 - 2¹ = 23531401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1120543 = 23531403 / (2 + 3 + 5 + 3 + 1 + 4 + 0 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23531403.

It is not an unprimeable number, because it can be changed into a prime (23531401) 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, 560251 + ... + 560292.

It is an arithmetic number, because the mean of its divisors is an integer number (4482176).

Almost surely, 2^23531403 is an apocalyptic number.

23531403 is a deficient number, since it is larger than the sum of its proper divisors (12326005).

23531403 is a wasteful number, since it uses less digits than its factorization.

23531403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120553.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 23531403 is about 4850.9177482204. The cubic root of 23531403 is about 286.5602454863.

Adding to 23531403 its reverse (30413532), we get a palindrome (53944935).

The spelling of 23531403 in words is "twenty-three million, five hundred thirty-one thousand, four hundred three".