391330245 has 16 divisors (see below), whose sum is σ = 627584832. Its totient is φ = 208224000.

The previous prime is 391330243. The next prime is 391330253. The reversal of 391330245 is 542033193.

It is not a de Polignac number, because 391330245 - 2¹ = 391330243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391330243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23631 + ... + 36620.

It is an arithmetic number, because the mean of its divisors is an integer number (39224052).

Almost surely, 2^391330245 is an apocalyptic number.

It is an amenable number.

391330245 is a deficient number, since it is larger than the sum of its proper divisors (236254587).

391330245 is a wasteful number, since it uses less digits than its factorization.

391330245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60692.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 391330245 is about 19782.0687745241. The cubic root of 391330245 is about 731.4440951640. Note that the first 3 decimals are identical.

The spelling of 391330245 in words is "three hundred ninety-one million, three hundred thirty thousand, two hundred forty-five".