42172512 has 48 divisors (see below), whose sum is σ = 117219312. Its totient is φ = 13230080.

The previous prime is 42172511. The next prime is 42172519. The reversal of 42172512 is 21527124.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11289 + ... + 14552.

It is an arithmetic number, because the mean of its divisors is an integer number (2442069).

Almost surely, 2^42172512 is an apocalyptic number.

It is an amenable number.

42172512 is an abundant number, since it is smaller than the sum of its proper divisors (75046800).

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

42172512 is a wasteful number, since it uses less digits than its factorization.

42172512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25871 (or 25863 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 42172512 is about 6494.0366491112. The cubic root of 42172512 is about 348.0779320774.

Adding to 42172512 its reverse (21527124), we get a palindrome (63699636).

The spelling of 42172512 in words is "forty-two million, one hundred seventy-two thousand, five hundred twelve".