391065438 has 16 divisors (see below), whose sum is σ = 782336016. Its totient is φ = 130320960.

The previous prime is 391065431. The next prime is 391065439. The reversal of 391065438 is 834560193.

It is a junction number, because it is equal to n+sod(n) for n = 391065396 and 391065405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391065431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28770 + ... + 40122.

It is an arithmetic number, because the mean of its divisors is an integer number (48896001).

Almost surely, 2^391065438 is an apocalyptic number.

391065438 is an abundant number, since it is smaller than the sum of its proper divisors (391270578).

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

391065438 is a wasteful number, since it uses less digits than its factorization.

391065438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17099.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 391065438 is about 19775.3745350120. The cubic root of 391065438 is about 731.2790723776.

It can be divided in two parts, 39106 and 5438, that added together give a palindrome (44544).

The spelling of 391065438 in words is "three hundred ninety-one million, sixty-five thousand, four hundred thirty-eight".