391348612 has 6 divisors (see below), whose sum is σ = 684860078. Its totient is φ = 195674304.

The previous prime is 391348597. The next prime is 391348613. The reversal of 391348612 is 216843193.

It can be written as a sum of positive squares in only one way, i.e., 320553216 + 70795396 = 17904^2 + 8414^2 .

It is a super-2 number, since 2×391348612² = 306307472228653088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391348613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48918573 + ... + 48918580.

Almost surely, 2^391348612 is an apocalyptic number.

It is an amenable number.

391348612 is a deficient number, since it is larger than the sum of its proper divisors (293511466).

391348612 is a wasteful number, since it uses less digits than its factorization.

391348612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97837157 (or 97837155 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 391348612 is about 19782.5330026263. The cubic root of 391348612 is about 731.4555383749.

It can be divided in two parts, 3913 and 48612, that added together give a palindrome (52525).

The spelling of 391348612 in words is "three hundred ninety-one million, three hundred forty-eight thousand, six hundred twelve".