39000991 has 4 divisors (see below), whose sum is σ = 39029392. Its totient is φ = 38972592.

The previous prime is 39000979. The next prime is 39001003. The reversal of 39000991 is 19900093.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (39000979) and next prime (39001003).

It is a cyclic number.

It is not a de Polignac number, because 39000991 - 2¹³ = 38992799 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 (39000931) 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, 12030 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (9757348).

Almost surely, 2^39000991 is an apocalyptic number.

39000991 is a deficient number, since it is larger than the sum of its proper divisors (28401).

39000991 is a wasteful number, since it uses less digits than its factorization.

39000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28400.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 39000991 is about 6245.0773413946. The cubic root of 39000991 is about 339.1240166622.

The spelling of 39000991 in words is "thirty-nine million, nine hundred ninety-one", and thus it is an aban number.