391917342 has 16 divisors (see below), whose sum is σ = 784067472. Its totient is φ = 130600320.

The previous prime is 391917307. The next prime is 391917359. The reversal of 391917342 is 243719193.

It is a self number, because there is not a number n which added to its sum of digits gives 391917342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18492 + ... + 33552.

It is an arithmetic number, because the mean of its divisors is an integer number (49004217).

Almost surely, 2^391917342 is an apocalyptic number.

391917342 is an abundant number, since it is smaller than the sum of its proper divisors (392150130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391917342 is a wasteful number, since it uses less digits than its factorization.

391917342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19403.

The product of its digits is 40824, while the sum is 39.

The square root of 391917342 is about 19796.9023334460. The cubic root of 391917342 is about 731.8096977608.

The spelling of 391917342 in words is "three hundred ninety-one million, nine hundred seventeen thousand, three hundred forty-two".