42747840 has 84 divisors (see below), whose sum is σ = 147044664. Its totient is φ = 11398656.

The previous prime is 42747829. The next prime is 42747841. The reversal of 42747840 is 4874724.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 42747795 and 42747804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42747841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4542 + ... + 10301.

Almost surely, 2^42747840 is an apocalyptic number.

42747840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42747840 is an abundant number, since it is smaller than the sum of its proper divisors (104296824).

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

42747840 is a wasteful number, since it uses less digits than its factorization.

42747840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14866 (or 14853 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 42747840 is about 6538.1832338961. The cubic root of 42747840 is about 349.6536437572.

The spelling of 42747840 in words is "forty-two million, seven hundred forty-seven thousand, eight hundred forty".