42090940 has 12 divisors (see below), whose sum is σ = 88391016. Its totient is φ = 16836368.

The previous prime is 42090899. The next prime is 42090949. The reversal of 42090940 is 4909024.

It is a junction number, because it is equal to n+sod(n) for n = 42090899 and 42090908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42090949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052254 + ... + 1052293.

It is an arithmetic number, because the mean of its divisors is an integer number (7365918).

Almost surely, 2^42090940 is an apocalyptic number.

It is an amenable number.

42090940 is an abundant number, since it is smaller than the sum of its proper divisors (46300076).

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

42090940 is a wasteful number, since it uses less digits than its factorization.

42090940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104556 (or 2104554 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 42090940 is about 6487.7530779153. The cubic root of 42090940 is about 347.8533644776.

Adding to 42090940 its reverse (4909024), we get a palindrome (46999964).

The spelling of 42090940 in words is "forty-two million, ninety thousand, nine hundred forty".