391790588242 has 4 divisors (see below), whose sum is σ = 587685882366. Its totient is φ = 195895294120.

The previous prime is 391790588227. The next prime is 391790588243. The reversal of 391790588242 is 242885097193.

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

It can be written as a sum of positive squares in only one way, i.e., 382528643121 + 9261945121 = 618489^2 + 96239^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (391790588243) 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 as a sum of consecutive naturals, namely, 97947647059 + ... + 97947647062.

Almost surely, 2^391790588242 is an apocalyptic number.

391790588242 is a deficient number, since it is larger than the sum of its proper divisors (195895294124).

391790588242 is a wasteful number, since it uses less digits than its factorization.

391790588242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195895294123.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 391790588242 in words is "three hundred ninety-one billion, seven hundred ninety million, five hundred eighty-eight thousand, two hundred forty-two".