391046087 has 16 divisors (see below), whose sum is σ = 439071840. Its totient is φ = 346088448.

The previous prime is 391046077. The next prime is 391046099. The reversal of 391046087 is 780640193.

It is not a de Polignac number, because 391046087 - 2¹⁰ = 391045063 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 391046087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391046017) 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, 39833 + ... + 48669.

It is an arithmetic number, because the mean of its divisors is an integer number (27441990).

Almost surely, 2^391046087 is an apocalyptic number.

391046087 is a deficient number, since it is larger than the sum of its proper divisors (48025753).

391046087 is a wasteful number, since it uses less digits than its factorization.

391046087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 391046087 is about 19774.8852588327. The cubic root of 391046087 is about 731.2670102747.

The spelling of 391046087 in words is "three hundred ninety-one million, forty-six thousand, eighty-seven".