42405510 has 64 divisors (see below), whose sum is σ = 117407232. Its totient is φ = 9601536.

The previous prime is 42405509. The next prime is 42405523. The reversal of 42405510 is 1550424.

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, 22837 + ... + 24623.

It is an arithmetic number, because the mean of its divisors is an integer number (1834488).

Almost surely, 2^42405510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42405510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58703616).

42405510 is an abundant number, since it is smaller than the sum of its proper divisors (75001722).

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

42405510 is a wasteful number, since it uses less digits than its factorization.

42405510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 42405510 is about 6511.9513204569. The cubic root of 42405510 is about 348.7177845655.

Adding to 42405510 its reverse (1550424), we get a palindrome (43955934).

The spelling of 42405510 in words is "forty-two million, four hundred five thousand, five hundred ten".