42540340 has 24 divisors (see below), whose sum is σ = 93219840. Its totient is φ = 16276128.

The previous prime is 42540331. The next prime is 42540349. The reversal of 42540340 is 4304524.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42540331) and next prime (42540349).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540349) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 45780 + ... + 46699.

It is an arithmetic number, because the mean of its divisors is an integer number (3884160).

Almost surely, 2^42540340 is an apocalyptic number.

It is an amenable number.

42540340 is an abundant number, since it is smaller than the sum of its proper divisors (50679500).

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

42540340 is a wasteful number, since it uses less digits than its factorization.

42540340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92511 (or 92509 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42540340 is about 6522.2956081429. The cubic root of 42540340 is about 349.0869808898.

Adding to 42540340 its reverse (4304524), we get a palindrome (46844864).

The spelling of 42540340 in words is "forty-two million, five hundred forty thousand, three hundred forty".