42151720 has 64 divisors (see below), whose sum is σ = 103259520. Its totient is φ = 15393024.

The previous prime is 42151699. The next prime is 42151729. The reversal of 42151720 is 2715124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 42151691 and 42151700.

It is not an unprimeable number, because it can be changed into a prime (42151729) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 53167 + ... + 53953.

It is an arithmetic number, because the mean of its divisors is an integer number (1613430).

Almost surely, 2^42151720 is an apocalyptic number.

42151720 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 42151720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51629760).

42151720 is an abundant number, since it is smaller than the sum of its proper divisors (61107800).

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

42151720 is a wasteful number, since it uses less digits than its factorization.

42151720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 42151720 is about 6492.4355984484. The cubic root of 42151720 is about 348.0207192491.

Adding to 42151720 its reverse (2715124), we get a palindrome (44866844).

The spelling of 42151720 in words is "forty-two million, one hundred fifty-one thousand, seven hundred twenty".