42911820 has 72 divisors (see below), whose sum is σ = 148765344. Its totient is φ = 9808128.

The previous prime is 42911797. The next prime is 42911831. The reversal of 42911820 is 2811924.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15769 + ... + 18288.

Almost surely, 2^42911820 is an apocalyptic number.

It is an amenable number.

42911820 is an abundant number, since it is smaller than the sum of its proper divisors (105853524).

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

42911820 is a wasteful number, since it uses less digits than its factorization.

42911820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34079 (or 34074 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42911820 is about 6550.7114117476. The cubic root of 42911820 is about 350.1001618095.

The spelling of 42911820 in words is "forty-two million, nine hundred eleven thousand, eight hundred twenty".