391068940 has 12 divisors (see below), whose sum is σ = 821244816. Its totient is φ = 156427568.

The previous prime is 391068917. The next prime is 391068967. The reversal of 391068940 is 49860193.

It is a junction number, because it is equal to n+sod(n) for n = 391068893 and 391068902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9776704 + ... + 9776743.

It is an arithmetic number, because the mean of its divisors is an integer number (68437068).

Almost surely, 2^391068940 is an apocalyptic number.

It is an amenable number.

391068940 is an abundant number, since it is smaller than the sum of its proper divisors (430175876).

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

391068940 is a wasteful number, since it uses less digits than its factorization.

391068940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553456 (or 19553454 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 391068940 is about 19775.4630792808. The cubic root of 391068940 is about 731.2812552448.

The spelling of 391068940 in words is "three hundred ninety-one million, sixty-eight thousand, nine hundred forty".