391946426 has 16 divisors (see below), whose sum is σ = 611094240. Its totient is φ = 188312880.

The previous prime is 391946353. The next prime is 391946431. The reversal of 391946426 is 624649193.

It is a happy 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, 3776 + ... + 28251.

It is an arithmetic number, because the mean of its divisors is an integer number (38193390).

Almost surely, 2^391946426 is an apocalyptic number.

391946426 is a deficient number, since it is larger than the sum of its proper divisors (219147814).

391946426 is a wasteful number, since it uses less digits than its factorization.

391946426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32269.

The product of its digits is 279936, while the sum is 44.

The square root of 391946426 is about 19797.6368791833. The cubic root of 391946426 is about 731.8277997298.

The spelling of 391946426 in words is "three hundred ninety-one million, nine hundred forty-six thousand, four hundred twenty-six".