391803868 has 6 divisors (see below), whose sum is σ = 685656776. Its totient is φ = 195901932.

The previous prime is 391803859. The next prime is 391803869. The reversal of 391803868 is 868308193.

It is a super-2 number, since 2×391803868² = 307020541959522848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391803869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48975480 + ... + 48975487.

Almost surely, 2^391803868 is an apocalyptic number.

It is an amenable number.

391803868 is a deficient number, since it is larger than the sum of its proper divisors (293852908).

391803868 is a wasteful number, since it uses less digits than its factorization.

391803868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97950971 (or 97950969 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 391803868 is about 19794.0361725445. The cubic root of 391803868 is about 731.7390626374.

The spelling of 391803868 in words is "three hundred ninety-one million, eight hundred three thousand, eight hundred sixty-eight".