40402221 has 4 divisors (see below), whose sum is σ = 53869632. Its totient is φ = 26934812.

The previous prime is 40402177. The next prime is 40402253. The reversal of 40402221 is 12220404.

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 40402221 - 2⁹ = 40401709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40402291) 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, 6733701 + ... + 6733706.

It is an arithmetic number, because the mean of its divisors is an integer number (13467408).

Almost surely, 2^40402221 is an apocalyptic number.

It is an amenable number.

40402221 is a deficient number, since it is larger than the sum of its proper divisors (13467411).

40402221 is a wasteful number, since it uses less digits than its factorization.

40402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13467410.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40402221 is about 6356.2741444969. The cubic root of 40402221 is about 343.1376821202.

Adding to 40402221 its reverse (12220404), we get a palindrome (52622625).

The spelling of 40402221 in words is "forty million, four hundred two thousand, two hundred twenty-one".