39641221 has 4 divisors (see below), whose sum is σ = 39708000. Its totient is φ = 39574444.

The previous prime is 39641209. The next prime is 39641233. The reversal of 39641221 is 12214693.

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 an interprime number because it is at equal distance from previous prime (39641209) and next prime (39641233).

It is a cyclic number.

It is not a de Polignac number, because 39641221 - 2¹⁹ = 39116933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39641221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39647221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32491 + ... + 33688.

It is an arithmetic number, because the mean of its divisors is an integer number (9927000).

Almost surely, 2^39641221 is an apocalyptic number.

It is an amenable number.

39641221 is a deficient number, since it is larger than the sum of its proper divisors (66779).

39641221 is an equidigital number, since it uses as much as digits as its factorization.

39641221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66778.

The product of its digits is 2592, while the sum is 28.

The square root of 39641221 is about 6296.1274605904. The cubic root of 39641221 is about 340.9696111297.

The spelling of 39641221 in words is "thirty-nine million, six hundred forty-one thousand, two hundred twenty-one".