42911640 has 64 divisors (see below), whose sum is σ = 143042400. Its totient is φ = 11442816.

The previous prime is 42911593. The next prime is 42911641. The reversal of 42911640 is 4611924.

42911640 is a `hidden beast` number, since 4 + 2 + 9 + 11 + 640 = 666.

42911640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42911641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18787 + ... + 20946.

Almost surely, 2^42911640 is an apocalyptic number.

42911640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42911640 is an abundant number, since it is smaller than the sum of its proper divisors (100130760).

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

42911640 is a wasteful number, since it uses less digits than its factorization.

42911640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39753 (or 39743 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 42911640 is about 6550.6976727674. The cubic root of 42911640 is about 350.0996722931.

The spelling of 42911640 in words is "forty-two million, nine hundred eleven thousand, six hundred forty".