42781140 has 36 divisors (see below), whose sum is σ = 129770004. Its totient is φ = 11408256.

The previous prime is 42781099. The next prime is 42781159. The reversal of 42781140 is 4118724.

It can be written as a sum of positive squares in 2 ways, for example, as 5253264 + 37527876 = 2292^2 + 6126^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118657 + ... + 119016.

Almost surely, 2^42781140 is an apocalyptic number.

It is an amenable number.

42781140 is an abundant number, since it is smaller than the sum of its proper divisors (86988864).

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

42781140 is a wasteful number, since it uses less digits than its factorization.

42781140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237688 (or 237683 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 42781140 is about 6540.7293171328. The cubic root of 42781140 is about 349.7444120414.

Adding to 42781140 its reverse (4118724), we get a palindrome (46899864).

The spelling of 42781140 in words is "forty-two million, seven hundred eighty-one thousand, one hundred forty".