42510420 has 72 divisors (see below), whose sum is σ = 133739424. Its totient is φ = 11334816.

The previous prime is 42510409. The next prime is 42510427. The reversal of 42510420 is 2401524.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 42510393 and 42510402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42510427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 487 + ... + 9233.

It is an arithmetic number, because the mean of its divisors is an integer number (1857492).

Almost surely, 2^42510420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42510420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66869712).

42510420 is an abundant number, since it is smaller than the sum of its proper divisors (91229004).

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

42510420 is a wasteful number, since it uses less digits than its factorization.

42510420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771 (or 8757 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 42510420 is about 6520.0015337422. The cubic root of 42510420 is about 349.0051202988.

Adding to 42510420 its reverse (2401524), we get a palindrome (44911944).

The spelling of 42510420 in words is "forty-two million, five hundred ten thousand, four hundred twenty".