39106991 has 8 divisors (see below), whose sum is σ = 48756864. Its totient is φ = 30472920.

The previous prime is 39106967. The next prime is 39107023. The reversal of 39106991 is 19960193.

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 39106991 - 2¹⁴ = 39090607 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 (39106901) 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, 253865 + ... + 254018.

It is an arithmetic number, because the mean of its divisors is an integer number (6094608).

Almost surely, 2^39106991 is an apocalyptic number.

39106991 is a deficient number, since it is larger than the sum of its proper divisors (9649873).

39106991 is a wasteful number, since it uses less digits than its factorization.

39106991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507901.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 39106991 is about 6253.5582670988. The cubic root of 39106991 is about 339.4309714964.

It can be divided in two parts, 3910 and 6991, that added together give a palindrome (10901).

The spelling of 39106991 in words is "thirty-nine million, one hundred six thousand, nine hundred ninety-one".