39550221 has 8 divisors (see below), whose sum is σ = 58592960. Its totient is φ = 26366796.

The previous prime is 39550219. The next prime is 39550223. The reversal of 39550221 is 12205593.

39550221 is a `hidden beast` number, since 395 + 50 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (39550219) and next prime (39550223).

It is not a de Polignac number, because 39550221 - 2¹ = 39550219 is a prime.

It is a super-2 number, since 2×39550221² = 3128439962297682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1464823 = 39550221 / (3 + 9 + 5 + 5 + 0 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39550223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732385 + ... + 732438.

It is an arithmetic number, because the mean of its divisors is an integer number (7324120).

Almost surely, 2^39550221 is an apocalyptic number.

It is an amenable number.

39550221 is a deficient number, since it is larger than the sum of its proper divisors (19042739).

39550221 is a wasteful number, since it uses less digits than its factorization.

39550221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464832 (or 1464826 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 39550221 is about 6288.8966440863. The cubic root of 39550221 is about 340.7085023910.

The spelling of 39550221 in words is "thirty-nine million, five hundred fifty thousand, two hundred twenty-one".