391889246 has 16 divisors (see below), whose sum is σ = 672824544. Its totient is φ = 167698944.

The previous prime is 391889227. The next prime is 391889263. The reversal of 391889246 is 642988193.

It is a happy number.

It is a super-2 number, since 2×391889246² = 307154362260897032, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 391889194 and 391889203.

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, 11375 + ... + 30218.

It is an arithmetic number, because the mean of its divisors is an integer number (42051534).

Almost surely, 2^391889246 is an apocalyptic number.

391889246 is a deficient number, since it is larger than the sum of its proper divisors (280935298).

391889246 is a wasteful number, since it uses less digits than its factorization.

391889246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42275.

The product of its digits is 746496, while the sum is 50.

The square root of 391889246 is about 19796.1927147621. The cubic root of 391889246 is about 731.7922098754.

The spelling of 391889246 in words is "three hundred ninety-one million, eight hundred eighty-nine thousand, two hundred forty-six".