391090385 has 8 divisors (see below), whose sum is σ = 536352576. Its totient is φ = 268176240.

The previous prime is 391090361. The next prime is 391090387. The reversal of 391090385 is 583090193.

391090385 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 391090385 - 2¹⁶ = 391024849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391090387) 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, 5586971 + ... + 5587040.

It is an arithmetic number, because the mean of its divisors is an integer number (67044072).

Almost surely, 2^391090385 is an apocalyptic number.

391090385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391090385 is a deficient number, since it is larger than the sum of its proper divisors (145262191).

391090385 is a wasteful number, since it uses less digits than its factorization.

391090385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11174023.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 391090385 is about 19776.0052841821. The cubic root of 391090385 is about 731.2946220609.

The spelling of 391090385 in words is "three hundred ninety-one million, ninety thousand, three hundred eighty-five".