42506840 has 16 divisors (see below), whose sum is σ = 95640480. Its totient is φ = 17002720.

The previous prime is 42506831. The next prime is 42506879. The reversal of 42506840 is 4860524.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531296 + ... + 531375.

It is an arithmetic number, because the mean of its divisors is an integer number (5977530).

Almost surely, 2^42506840 is an apocalyptic number.

42506840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42506840 is an abundant number, since it is smaller than the sum of its proper divisors (53133640).

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

42506840 is a wasteful number, since it uses less digits than its factorization.

42506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062682 (or 1062678 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 42506840 is about 6519.7269881491. The cubic root of 42506840 is about 348.9953229095.

The spelling of 42506840 in words is "forty-two million, five hundred six thousand, eight hundred forty".