39116221 has 4 divisors (see below), whose sum is σ = 39128832. Its totient is φ = 39103612.

The previous prime is 39116219. The next prime is 39116237. The reversal of 39116221 is 12261193.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12261193 = 7 ⋅1751599.

It is a cyclic number.

It is not a de Polignac number, because 39116221 - 2¹ = 39116219 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 (39116291) 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, 1956 + ... + 9058.

It is an arithmetic number, because the mean of its divisors is an integer number (9782208).

It is a 3102-hyperperfect number.

Almost surely, 2^39116221 is an apocalyptic number.

It is an amenable number.

39116221 is a deficient number, since it is larger than the sum of its proper divisors (12611).

39116221 is an equidigital number, since it uses as much as digits as its factorization.

39116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12610.

The product of its digits is 648, while the sum is 25.

The square root of 39116221 is about 6254.2962034109. The cubic root of 39116221 is about 339.4576734691.

The spelling of 39116221 in words is "thirty-nine million, one hundred sixteen thousand, two hundred twenty-one".