40821920 has 24 divisors (see below), whose sum is σ = 96442164. Its totient is φ = 16328704.

The previous prime is 40821919. The next prime is 40821929. The reversal of 40821920 is 2912804.

It can be written as a sum of positive squares in 2 ways, for example, as 40806544 + 15376 = 6388^2 + 124^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40821920.

It is not an unprimeable number, because it can be changed into a prime (40821929) 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, 127409 + ... + 127728.

Almost surely, 2^40821920 is an apocalyptic number.

40821920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40821920 is an abundant number, since it is smaller than the sum of its proper divisors (55620244).

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

40821920 is a wasteful number, since it uses less digits than its factorization.

40821920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255152 (or 255144 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40821920 is about 6389.2033932252. The cubic root of 40821920 is about 344.3217649207.

The spelling of 40821920 in words is "forty million, eight hundred twenty-one thousand, nine hundred twenty".