40021801 has 4 divisors (see below), whose sum is σ = 40050000. Its totient is φ = 39993604.

The previous prime is 40021789. The next prime is 40021819. The reversal of 40021801 is 10812004.

It is a happy number.

40021801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40021801 - 2¹¹ = 40019753 is a prime.

It is a super-3 number, since 3×40021801³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40021841) 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 3 ways as a sum of consecutive naturals, for example, 11851 + ... + 14848.

It is an arithmetic number, because the mean of its divisors is an integer number (10012500).

Almost surely, 2^40021801 is an apocalyptic number.

It is an amenable number.

40021801 is a deficient number, since it is larger than the sum of its proper divisors (28199).

40021801 is a wasteful number, since it uses less digits than its factorization.

40021801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28198.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 40021801 is about 6326.2786059420. The cubic root of 40021801 is about 342.0573100270.

Adding to 40021801 its reverse (10812004), we get a palindrome (50833805).

It can be divided in two parts, 400 and 21801, that added together give a square (22201 = 149²).

The spelling of 40021801 in words is "forty million, twenty-one thousand, eight hundred one".