391387043 has 4 divisors (see below), whose sum is σ = 391734840. Its totient is φ = 391039248.

The previous prime is 391387037. The next prime is 391387057. The reversal of 391387043 is 340783193.

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 391387043 - 2²⁰ = 390338467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391386988 and 391387006.

It is not an unprimeable number, because it can be changed into a prime (391387013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172205 + ... + 174462.

It is an arithmetic number, because the mean of its divisors is an integer number (97933710).

Almost surely, 2^391387043 is an apocalyptic number.

391387043 is a deficient number, since it is larger than the sum of its proper divisors (347797).

391387043 is a wasteful number, since it uses less digits than its factorization.

391387043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347796.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 391387043 is about 19783.5043154644. The cubic root of 391387043 is about 731.4794809219.

The spelling of 391387043 in words is "three hundred ninety-one million, three hundred eighty-seven thousand, forty-three".