391998494 has 8 divisors (see below), whose sum is σ = 599092200. Its totient is φ = 192301096.

The previous prime is 391998493. The next prime is 391998517. The reversal of 391998494 is 494899193.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391998491) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1848944 + ... + 1849155.

It is an arithmetic number, because the mean of its divisors is an integer number (74886525).

Almost surely, 2^391998494 is an apocalyptic number.

391998494 is a deficient number, since it is larger than the sum of its proper divisors (207093706).

391998494 is a wasteful number, since it uses less digits than its factorization.

391998494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698154.

The product of its digits is 2519424, while the sum is 56.

The square root of 391998494 is about 19798.9518409435. The cubic root of 391998494 is about 731.8602047731.

The spelling of 391998494 in words is "three hundred ninety-one million, nine hundred ninety-eight thousand, four hundred ninety-four".