40032820 has 12 divisors (see below), whose sum is σ = 84068964. Its totient is φ = 16013120.

The previous prime is 40032803. The next prime is 40032869. The reversal of 40032820 is 2823004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 21473956 = 4308^2 + 4634^2 .

It is a congruent number.

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, 1000801 + ... + 1000840.

It is an arithmetic number, because the mean of its divisors is an integer number (7005747).

Almost surely, 2^40032820 is an apocalyptic number.

It is an amenable number.

40032820 is an abundant number, since it is smaller than the sum of its proper divisors (44036144).

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

40032820 is a wasteful number, since it uses less digits than its factorization.

40032820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001650 (or 2001648 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 40032820 is about 6327.1494371478. The cubic root of 40032820 is about 342.0886994493.

Adding to 40032820 its reverse (2823004), we get a palindrome (42855824).

The spelling of 40032820 in words is "forty million, thirty-two thousand, eight hundred twenty".