42009732 has 48 divisors (see below), whose sum is σ = 109267200. Its totient is φ = 13957920.

The previous prime is 42009727. The next prime is 42009739. The reversal of 42009732 is 23790024.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 42009696 and 42009705.

It is not an unprimeable number, because it can be changed into a prime (42009739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58069 + ... + 58787.

It is an arithmetic number, because the mean of its divisors is an integer number (2276400).

Almost surely, 2^42009732 is an apocalyptic number.

It is an amenable number.

42009732 is an abundant number, since it is smaller than the sum of its proper divisors (67257468).

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

42009732 is a wasteful number, since it uses less digits than its factorization.

42009732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 42009732 is about 6481.4914950187. The cubic root of 42009732 is about 347.6295105829.

Adding to 42009732 its reverse (23790024), we get a palindrome (65799756).

The spelling of 42009732 in words is "forty-two million, nine thousand, seven hundred thirty-two".