39187221 has 8 divisors (see below), whose sum is σ = 52355520. Its totient is φ = 26071872.

The previous prime is 39187199. The next prime is 39187229. The reversal of 39187221 is 12278193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39187221 - 2⁵ = 39187189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39187229) 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, 11476 + ... + 14493.

It is an arithmetic number, because the mean of its divisors is an integer number (6544440).

Almost surely, 2^39187221 is an apocalyptic number.

It is an amenable number.

39187221 is a deficient number, since it is larger than the sum of its proper divisors (13168299).

39187221 is a wasteful number, since it uses less digits than its factorization.

39187221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26475.

The product of its digits is 6048, while the sum is 33.

The square root of 39187221 is about 6259.9697283613. The cubic root of 39187221 is about 339.6629329637.

The spelling of 39187221 in words is "thirty-nine million, one hundred eighty-seven thousand, two hundred twenty-one".