42821920 has 24 divisors (see below), whose sum is σ = 101167164. Its totient is φ = 17128704.

The previous prime is 42821903. The next prime is 42821959. The reversal of 42821920 is 2912824.

It can be written as a sum of positive squares in 2 ways, for example, as 42354064 + 467856 = 6508^2 + 684^2 .

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, 133659 + ... + 133978.

Almost surely, 2^42821920 is an apocalyptic number.

42821920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42821920 is an abundant number, since it is smaller than the sum of its proper divisors (58345244).

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

42821920 is a wasteful number, since it uses less digits than its factorization.

42821920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267652 (or 267644 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 42821920 is about 6543.8459639573. The cubic root of 42821920 is about 349.8555049803.

The spelling of 42821920 in words is "forty-two million, eight hundred twenty-one thousand, nine hundred twenty".