42631840 has 24 divisors (see below), whose sum is σ = 100718100. Its totient is φ = 17052672.

The previous prime is 42631817. The next prime is 42631843. The reversal of 42631840 is 4813624.

It can be written as a sum of positive squares in 2 ways, for example, as 41525136 + 1106704 = 6444^2 + 1052^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42631799 and 42631808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42631843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133065 + ... + 133384.

Almost surely, 2^42631840 is an apocalyptic number.

42631840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42631840 is an abundant number, since it is smaller than the sum of its proper divisors (58086260).

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

42631840 is a wasteful number, since it uses less digits than its factorization.

42631840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266464 (or 266456 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 42631840 is about 6529.3062418606. The cubic root of 42631840 is about 349.3370853406.

The spelling of 42631840 in words is "forty-two million, six hundred thirty-one thousand, eight hundred forty".