40381820 has 24 divisors (see below), whose sum is σ = 85645728. Its totient is φ = 15992000.

The previous prime is 40381819. The next prime is 40381823. The reversal of 40381820 is 2818304.

40381820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 40381820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40381823) 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 7 ways as a sum of consecutive naturals, for example, 7976 + ... + 12015.

It is an arithmetic number, because the mean of its divisors is an integer number (3568572).

Almost surely, 2^40381820 is an apocalyptic number.

It is an amenable number.

40381820 is an abundant number, since it is smaller than the sum of its proper divisors (45263908).

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

40381820 is a wasteful number, since it uses less digits than its factorization.

40381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101 (or 20099 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 40381820 is about 6354.6691495309. The cubic root of 40381820 is about 343.0799168928.

The spelling of 40381820 in words is "forty million, three hundred eighty-one thousand, eight hundred twenty".