39443221 has 12 divisors (see below), whose sum is σ = 42768012. Its totient is φ = 36345024.

The previous prime is 39443203. The next prime is 39443233. The reversal of 39443221 is 12234493.

It can be written as a sum of positive squares in 2 ways, for example, as 33802596 + 5640625 = 5814^2 + 2375^2 .

It is not a de Polignac number, because 39443221 - 2¹³ = 39435029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39443221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39443021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11881 + ... + 14833.

It is an arithmetic number, because the mean of its divisors is an integer number (3564001).

Almost surely, 2^39443221 is an apocalyptic number.

It is an amenable number.

39443221 is a deficient number, since it is larger than the sum of its proper divisors (3324791).

39443221 is a wasteful number, since it uses less digits than its factorization.

39443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028 (or 3009 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 39443221 is about 6280.3838258501. The cubic root of 39443221 is about 340.4009715737.

The spelling of 39443221 in words is "thirty-nine million, four hundred forty-three thousand, two hundred twenty-one".