391077047 has 4 divisors (see below), whose sum is σ = 391480776. Its totient is φ = 390673320.

The previous prime is 391077031. The next prime is 391077077. The reversal of 391077047 is 740770193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 391077047 - 2⁴ = 391077031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391077047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391077077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200408 + ... + 202349.

It is an arithmetic number, because the mean of its divisors is an integer number (97870194).

Almost surely, 2^391077047 is an apocalyptic number.

391077047 is a deficient number, since it is larger than the sum of its proper divisors (403729).

391077047 is an equidigital number, since it uses as much as digits as its factorization.

391077047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403728.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 391077047 is about 19775.6680544552. The cubic root of 391077047 is about 731.2863084511.

The spelling of 391077047 in words is "three hundred ninety-one million, seventy-seven thousand, forty-seven".