40021580 has 12 divisors (see below), whose sum is σ = 84045360. Its totient is φ = 16008624.

The previous prime is 40021573. The next prime is 40021591. The reversal of 40021580 is 8512004.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2001079 = 40021580 / (4 + 0 + 0 + 2 + 1 + 5 + 8 + 0).

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, 1000520 + ... + 1000559.

It is an arithmetic number, because the mean of its divisors is an integer number (7003780).

Almost surely, 2^40021580 is an apocalyptic number.

It is an amenable number.

40021580 is an abundant number, since it is smaller than the sum of its proper divisors (44023780).

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

40021580 is a wasteful number, since it uses less digits than its factorization.

40021580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001088 (or 2001086 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 40021580 is about 6326.2611390931. The cubic root of 40021580 is about 342.0566804134.

Adding to 40021580 its reverse (8512004), we get a palindrome (48533584).

The spelling of 40021580 in words is "forty million, twenty-one thousand, five hundred eighty".