40032221 has 4 divisors (see below), whose sum is σ = 42139200. Its totient is φ = 37925244.

The previous prime is 40032211. The next prime is 40032227. The reversal of 40032221 is 12223004.

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 a de Polignac number, because none of the positive numbers 2^k-40032221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40032196 and 40032205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40032227) 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, 1053461 + ... + 1053498.

It is an arithmetic number, because the mean of its divisors is an integer number (10534800).

Almost surely, 2^40032221 is an apocalyptic number.

It is an amenable number.

40032221 is a deficient number, since it is larger than the sum of its proper divisors (2106979).

40032221 is a wasteful number, since it uses less digits than its factorization.

40032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106978.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40032221 is about 6327.1021012783. The cubic root of 40032221 is about 342.0869932479.

Adding to 40032221 its reverse (12223004), we get a palindrome (52255225).

The spelling of 40032221 in words is "forty million, thirty-two thousand, two hundred twenty-one".