42918940 has 24 divisors (see below), whose sum is σ = 91026432. Its totient is φ = 16996800.

The previous prime is 42918917. The next prime is 42918959. The reversal of 42918940 is 4981924.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 42918940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8604 + ... + 12643.

It is an arithmetic number, because the mean of its divisors is an integer number (3792768).

Almost surely, 2^42918940 is an apocalyptic number.

It is an amenable number.

42918940 is an abundant number, since it is smaller than the sum of its proper divisors (48107492).

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

42918940 is a wasteful number, since it uses less digits than its factorization.

42918940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21357 (or 21355 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 42918940 is about 6551.2548416315. The cubic root of 42918940 is about 350.1195238042.

It can be divided in two parts, 4291 and 8940, that added together give a palindrome (13231).

The spelling of 42918940 in words is "forty-two million, nine hundred eighteen thousand, nine hundred forty".