391064 has 8 divisors (see below), whose sum is σ = 733260. Its totient is φ = 195528.

The previous prime is 391063. The next prime is 391067. The reversal of 391064 is 460193.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24434 + ... + 24449.

2³⁹¹⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

391064 is a deficient number, since it is larger than the sum of its proper divisors (342196).

391064 is a wasteful number, since it uses less digits than its factorization.

391064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48889 (or 48885 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 391064 is about 625.3511013823. The cubic root of 391064 is about 73.1278176040.

The spelling of 391064 in words is "three hundred ninety-one thousand, sixty-four".