391448345 has 8 divisors (see below), whose sum is σ = 482433864. Its totient is φ = 304694784.

The previous prime is 391448333. The next prime is 391448363. The reversal of 391448345 is 543844193.

It can be written as a sum of positive squares in 4 ways, for example, as 11042329 + 380406016 = 3323^2 + 19504^2 .

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 391448345 - 2⁴ = 391448329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057784 + ... + 1058153.

It is an arithmetic number, because the mean of its divisors is an integer number (60304233).

Almost surely, 2^391448345 is an apocalyptic number.

It is an amenable number.

391448345 is a deficient number, since it is larger than the sum of its proper divisors (90985519).

391448345 is a wasteful number, since it uses less digits than its factorization.

391448345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115979.

The product of its digits is 207360, while the sum is 41.

The square root of 391448345 is about 19785.0535758688. The cubic root of 391448345 is about 731.5176688785.

The spelling of 391448345 in words is "three hundred ninety-one million, four hundred forty-eight thousand, three hundred forty-five".