391012 has 12 divisors (see below), whose sum is σ = 694960. Its totient is φ = 192456.

The previous prime is 391009. The next prime is 391019. The reversal of 391012 is 210193.

It is not an unprimeable number, because it can be changed into a prime (391019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462 + ... + 997.

2³⁹¹⁰¹² is an apocalyptic number.

It is an amenable number.

391012 is a deficient number, since it is larger than the sum of its proper divisors (303948).

391012 is a wasteful number, since it uses less digits than its factorization.

391012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 391012 is about 625.3095233562. The cubic root of 391012 is about 73.1245761779.

The spelling of 391012 in words is "three hundred ninety-one thousand, twelve".