391381485 has 32 divisors (see below), whose sum is σ = 699038208. Its totient is φ = 185344320.

The previous prime is 391381483. The next prime is 391381499. The reversal of 391381485 is 584183193.

It is not a de Polignac number, because 391381485 - 2¹ = 391381483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391381481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20487 + ... + 34676.

It is an arithmetic number, because the mean of its divisors is an integer number (21844944).

Almost surely, 2^391381485 is an apocalyptic number.

It is an amenable number.

391381485 is a deficient number, since it is larger than the sum of its proper divisors (307656723).

391381485 is a wasteful number, since it uses less digits than its factorization.

391381485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55225.

The product of its digits is 103680, while the sum is 42.

The square root of 391381485 is about 19783.3638444022. The cubic root of 391381485 is about 731.4760183800.

The spelling of 391381485 in words is "three hundred ninety-one million, three hundred eighty-one thousand, four hundred eighty-five".