23172015 has 16 divisors (see below), whose sum is σ = 38354400. Its totient is φ = 11932032.

The previous prime is 23171999. The next prime is 23172031. The reversal of 23172015 is 51027132.

It is an interprime number because it is at equal distance from previous prime (23171999) and next prime (23172031).

It is not a de Polignac number, because 23172015 - 2⁴ = 23171999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23171982 and 23172000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26200 + ... + 27069.

It is an arithmetic number, because the mean of its divisors is an integer number (2397150).

Almost surely, 2^23172015 is an apocalyptic number.

23172015 is a deficient number, since it is larger than the sum of its proper divisors (15182385).

23172015 is a wasteful number, since it uses less digits than its factorization.

23172015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53306.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 23172015 is about 4813.7319202465. The cubic root of 23172015 is about 285.0939056512.

Adding to 23172015 its reverse (51027132), we get a palindrome (74199147).

The spelling of 23172015 in words is "twenty-three million, one hundred seventy-two thousand, fifteen".