42043940 has 24 divisors (see below), whose sum is σ = 88421760. Its totient is φ = 16792928.

The previous prime is 42043933. The next prime is 42043943. The reversal of 42043940 is 4934024.

It is not an unprimeable number, because it can be changed into a prime (42043943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19349 + ... + 21411.

It is an arithmetic number, because the mean of its divisors is an integer number (3684240).

Almost surely, 2^42043940 is an apocalyptic number.

It is an amenable number.

42043940 is an abundant number, since it is smaller than the sum of its proper divisors (46377820).

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

42043940 is a wasteful number, since it uses less digits than its factorization.

42043940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42043940 is about 6484.1298568119. The cubic root of 42043940 is about 347.7238417727.

Adding to 42043940 its reverse (4934024), we get a palindrome (46977964).

The spelling of 42043940 in words is "forty-two million, forty-three thousand, nine hundred forty".