39221391 has 8 divisors (see below), whose sum is σ = 57049344. Its totient is φ = 23770520.

The previous prime is 39221389. The next prime is 39221407. The reversal of 39221391 is 19312293.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 39221391 - 2¹ = 39221389 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39221341) 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, 594231 + ... + 594296.

It is an arithmetic number, because the mean of its divisors is an integer number (7131168).

Almost surely, 2^39221391 is an apocalyptic number.

39221391 is a deficient number, since it is larger than the sum of its proper divisors (17827953).

39221391 is a wasteful number, since it uses less digits than its factorization.

39221391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188541.

The product of its digits is 2916, while the sum is 30.

The square root of 39221391 is about 6262.6983800914. The cubic root of 39221391 is about 339.7616293442.

The spelling of 39221391 in words is "thirty-nine million, two hundred twenty-one thousand, three hundred ninety-one".