42131940 has 24 divisors (see below), whose sum is σ = 117969600. Its totient is φ = 11235168.

The previous prime is 42131939. The next prime is 42131941. The reversal of 42131940 is 4913124.

It is an interprime number because it is at equal distance from previous prime (42131939) and next prime (42131941).

It is a self number, because there is not a number n which added to its sum of digits gives 42131940.

It is not an unprimeable number, because it can be changed into a prime (42131941) 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, 351040 + ... + 351159.

It is an arithmetic number, because the mean of its divisors is an integer number (4915400).

Almost surely, 2^42131940 is an apocalyptic number.

It is an amenable number.

42131940 is an abundant number, since it is smaller than the sum of its proper divisors (75837660).

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

42131940 is a wasteful number, since it uses less digits than its factorization.

42131940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702211 (or 702209 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 42131940 is about 6490.9121084791. The cubic root of 42131940 is about 347.9662736505.

It can be divided in two parts, 42131 and 940, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42131940 in words is "forty-two million, one hundred thirty-one thousand, nine hundred forty".