42940 has 24 divisors (see below), whose sum is σ = 95760. Its totient is φ = 16128.

The previous prime is 42937. The next prime is 42943. The reversal of 42940 is 4924.

It is an interprime number because it is at equal distance from previous prime (42937) and next prime (42943).

It is a Harshad number since it is a multiple of its sum of digits (19).

42940 is an undulating number in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324 + ... + 436.

It is an arithmetic number, because the mean of its divisors is an integer number (3990).

2⁴²⁹⁴⁰ 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 42940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47880).

42940 is an abundant number, since it is smaller than the sum of its proper divisors (52820).

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

42940 is a wasteful number, since it uses less digits than its factorization.

42940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 42940 is about 207.2196901841. The cubic root of 42940 is about 35.0176781443.

The spelling of 42940 in words is "forty-two thousand, nine hundred forty".