391286406 has 16 divisors (see below), whose sum is σ = 894369024. Its totient is φ = 111796104.

The previous prime is 391286387. The next prime is 391286417. The reversal of 391286406 is 604682193.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4658130 + ... + 4658213.

It is an arithmetic number, because the mean of its divisors is an integer number (55898064).

Almost surely, 2^391286406 is an apocalyptic number.

391286406 is an abundant number, since it is smaller than the sum of its proper divisors (503082618).

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

391286406 is a wasteful number, since it uses less digits than its factorization.

391286406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316355.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 391286406 is about 19780.9606945669. The cubic root of 391286406 is about 731.4167806596.

The spelling of 391286406 in words is "three hundred ninety-one million, two hundred eighty-six thousand, four hundred six".