42170520 has 128 divisors (see below), whose sum is σ = 147133440. Its totient is φ = 9469440.

The previous prime is 42170507. The next prime is 42170533. The reversal of 42170520 is 2507124.

It is an interprime number because it is at equal distance from previous prime (42170507) and next prime (42170533).

It is a super-3 number, since 3×42170520³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50829 + ... + 51651.

It is an arithmetic number, because the mean of its divisors is an integer number (1149480).

Almost surely, 2^42170520 is an apocalyptic number.

42170520 is a gapful number since it is divisible by the number (40) 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 42170520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73566720).

42170520 is an abundant number, since it is smaller than the sum of its proper divisors (104962920).

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

42170520 is a wasteful number, since it uses less digits than its factorization.

42170520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 42170520 is about 6493.8832758219. The cubic root of 42170520 is about 348.0724515552.

Adding to 42170520 its reverse (2507124), we get a palindrome (44677644).

The spelling of 42170520 in words is "forty-two million, one hundred seventy thousand, five hundred twenty".