42861940 has 24 divisors (see below), whose sum is σ = 98193312. Its totient is φ = 15586080.

The previous prime is 42861911. The next prime is 42861941. The reversal of 42861940 is 4916824.

It is a junction number, because it is equal to n+sod(n) for n = 42861896 and 42861905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42861941) 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, 97194 + ... + 97633.

It is an arithmetic number, because the mean of its divisors is an integer number (4091388).

Almost surely, 2^42861940 is an apocalyptic number.

It is an amenable number.

42861940 is an abundant number, since it is smaller than the sum of its proper divisors (55331372).

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

42861940 is a wasteful number, since it uses less digits than its factorization.

42861940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194847 (or 194845 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 42861940 is about 6546.9030846653. The cubic root of 42861940 is about 349.9644589761.

Subtracting from 42861940 its reverse (4916824), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 4286 and 1940, that added together give a palindrome (6226).

The spelling of 42861940 in words is "forty-two million, eight hundred sixty-one thousand, nine hundred forty".