391969914 has 24 divisors (see below), whose sum is σ = 911930688. Its totient is φ = 111991320.

The previous prime is 391969909. The next prime is 391969939. The reversal of 391969914 is 419969193.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 666322 + ... + 666909.

It is an arithmetic number, because the mean of its divisors is an integer number (37997112).

Almost surely, 2^391969914 is an apocalyptic number.

391969914 is an abundant number, since it is smaller than the sum of its proper divisors (519960774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391969914 is a wasteful number, since it uses less digits than its factorization.

391969914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333250 (or 1333243 counting only the distinct ones).

The product of its digits is 472392, while the sum is 51.

The square root of 391969914 is about 19798.2300724080. The cubic root of 391969914 is about 731.8424180780.

The spelling of 391969914 in words is "three hundred ninety-one million, nine hundred sixty-nine thousand, nine hundred fourteen".