391268649 has 8 divisors (see below), whose sum is σ = 525015040. Its totient is φ = 259184016.

The previous prime is 391268627. The next prime is 391268659. The reversal of 391268649 is 946862193.

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

It is not a de Polignac number, because 391268649 - 2¹⁵ = 391235881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 391268598 and 391268607.

It is not an unprimeable number, because it can be changed into a prime (391268659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414889 + ... + 415830.

It is an arithmetic number, because the mean of its divisors is an integer number (65626880).

Almost surely, 2^391268649 is an apocalyptic number.

It is an amenable number.

391268649 is a deficient number, since it is larger than the sum of its proper divisors (133746391).

391268649 is a wasteful number, since it uses less digits than its factorization.

391268649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830879.

The product of its digits is 559872, while the sum is 48.

The square root of 391268649 is about 19780.5118487869. The cubic root of 391268649 is about 731.4057163309.

The spelling of 391268649 in words is "three hundred ninety-one million, two hundred sixty-eight thousand, six hundred forty-nine".