391998180485 has 8 divisors (see below), whose sum is σ = 470421443616. Its totient is φ = 313582793040.

The previous prime is 391998180461. The next prime is 391998180527. The reversal of 391998180485 is 584081899193.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391998180485 - 2⁶ = 391998180421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1858859 + ... + 2058968.

It is an arithmetic number, because the mean of its divisors is an integer number (58802680452).

Almost surely, 2^391998180485 is an apocalyptic number.

It is an amenable number.

391998180485 is a deficient number, since it is larger than the sum of its proper divisors (78423263131).

391998180485 is a wasteful number, since it uses less digits than its factorization.

391998180485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3937843.

The product of its (nonzero) digits is 22394880, while the sum is 65.

The spelling of 391998180485 in words is "three hundred ninety-one billion, nine hundred ninety-eight million, one hundred eighty thousand, four hundred eighty-five".