47172423 has 4 divisors (see below), whose sum is σ = 62896568. Its totient is φ = 31448280.

The previous prime is 47172347. The next prime is 47172439. The reversal of 47172423 is 32427174.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-47172423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47172493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7862068 + ... + 7862073.

It is an arithmetic number, because the mean of its divisors is an integer number (15724142).

Almost surely, 2^47172423 is an apocalyptic number.

47172423 is a deficient number, since it is larger than the sum of its proper divisors (15724145).

47172423 is a wasteful number, since it uses less digits than its factorization.

47172423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15724144.

The product of its digits is 9408, while the sum is 30.

The square root of 47172423 is about 6868.2183279217. The cubic root of 47172423 is about 361.3233776943.

Adding to 47172423 its reverse (32427174), we get a palindrome (79599597).

It can be divided in two parts, 4717 and 2423, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 47172423 in words is "forty-seven million, one hundred seventy-two thousand, four hundred twenty-three".