671491386 has 12 divisors (see below), whose sum is σ = 1454898042. Its totient is φ = 223830456.

The previous prime is 671491351. The next prime is 671491409. The reversal of 671491386 is 683194176.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 521894025 + 149597361 = 22845^2 + 12231^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18652521 + ... + 18652556.

Almost surely, 2^671491386 is an apocalyptic number.

671491386 is an abundant number, since it is smaller than the sum of its proper divisors (783406656).

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

671491386 is a wasteful number, since it uses less digits than its factorization.

671491386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37305085 (or 37305082 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 671491386 is about 25913.1508311899. The cubic root of 671491386 is about 875.6827915735.

The spelling of 671491386 in words is "six hundred seventy-one million, four hundred ninety-one thousand, three hundred eighty-six".