42040530 has 72 divisors (see below), whose sum is σ = 127164492. Its totient is φ = 9608256.

The previous prime is 42040469. The next prime is 42040601. The reversal of 42040530 is 3504024.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39425841 + 2614689 = 6279^2 + 1617^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 357 + ... + 9176.

Almost surely, 2^42040530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42040530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63582246).

42040530 is an abundant number, since it is smaller than the sum of its proper divisors (85123962).

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

42040530 is a wasteful number, since it uses less digits than its factorization.

42040530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560 (or 9550 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 42040530 is about 6483.8669017801. The cubic root of 42040530 is about 347.7144407321.

Adding to 42040530 its reverse (3504024), we get a palindrome (45544554).

The spelling of 42040530 in words is "forty-two million, forty thousand, five hundred thirty".