42540032 has 22 divisors (see below), whose sum is σ = 85040568. Its totient is φ = 21269504.

The previous prime is 42540019. The next prime is 42540037. The reversal of 42540032 is 23004524.

It is a super-2 number, since 2×42540032² = 3619308645122048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42539986 and 42540013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19748 + ... + 21795.

Almost surely, 2^42540032 is an apocalyptic number.

It is an amenable number.

42540032 is a deficient number, since it is larger than the sum of its proper divisors (42500536).

42540032 is an equidigital number, since it uses as much as digits as its factorization.

42540032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41563 (or 41545 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 42540032 is about 6522.2719967815. The cubic root of 42540032 is about 349.0861384028.

Adding to 42540032 its reverse (23004524), we get a palindrome (65544556).

The spelling of 42540032 in words is "forty-two million, five hundred forty thousand, thirty-two".