39860221 has 4 divisors (see below), whose sum is σ = 40049344. Its totient is φ = 39671100.

The previous prime is 39860179. The next prime is 39860231. The reversal of 39860221 is 12206893.

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 39860221 - 2¹⁵ = 39827453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39860231) 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, 94245 + ... + 94666.

It is an arithmetic number, because the mean of its divisors is an integer number (10012336).

Almost surely, 2^39860221 is an apocalyptic number.

It is an amenable number.

39860221 is a deficient number, since it is larger than the sum of its proper divisors (189123).

39860221 is a wasteful number, since it uses less digits than its factorization.

39860221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189122.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 39860221 is about 6313.4951492814. The cubic root of 39860221 is about 341.5963598610.

The spelling of 39860221 in words is "thirty-nine million, eight hundred sixty thousand, two hundred twenty-one".