391687348 has 12 divisors (see below), whose sum is σ = 738180100. Its totient is φ = 180778752.

The previous prime is 391687343. The next prime is 391687363. The reversal of 391687348 is 843786193.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 358647844 = 5748^2 + 18938^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391687343) 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, 3766173 + ... + 3766276.

Almost surely, 2^391687348 is an apocalyptic number.

It is an amenable number.

391687348 is a deficient number, since it is larger than the sum of its proper divisors (346492752).

391687348 is a wasteful number, since it uses less digits than its factorization.

391687348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7532466 (or 7532464 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 391687348 is about 19791.0926429038. The cubic root of 391687348 is about 731.6665172509. Note that the first 3 decimals are identical.

The spelling of 391687348 in words is "three hundred ninety-one million, six hundred eighty-seven thousand, three hundred forty-eight".