42865140 has 72 divisors (see below), whose sum is σ = 126735840. Its totient is φ = 10823616.

The previous prime is 42865139. The next prime is 42865153. The reversal of 42865140 is 4156824.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42865098 and 42865107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20671 + ... + 22649.

It is an arithmetic number, because the mean of its divisors is an integer number (1760220).

Almost surely, 2^42865140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42865140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63367920).

42865140 is an abundant number, since it is smaller than the sum of its proper divisors (83870700).

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

42865140 is a wasteful number, since it uses less digits than its factorization.

42865140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2008 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 42865140 is about 6547.1474704638. The cubic root of 42865140 is about 349.9731680111.

The spelling of 42865140 in words is "forty-two million, eight hundred sixty-five thousand, one hundred forty".