1391686479 has 6 divisors (see below), whose sum is σ = 2010213816. Its totient is φ = 927790980.

The previous prime is 1391686477. The next prime is 1391686489. The reversal of 1391686479 is 9746861931.

1391686479 is a `hidden beast` number, since 1 + 3 + 9 + 168 + 6 + 479 = 666.

It is not a de Polignac number, because 1391686479 - 2¹ = 1391686477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391686477) 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 5 ways as a sum of consecutive naturals, for example, 77315907 + ... + 77315924.

It is an arithmetic number, because the mean of its divisors is an integer number (335035636).

Almost surely, 2^1391686479 is an apocalyptic number.

1391686479 is a deficient number, since it is larger than the sum of its proper divisors (618527337).

1391686479 is a wasteful number, since it uses less digits than its factorization.

1391686479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154631837 (or 154631834 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1391686479 is about 37305.3143533197. The cubic root of 1391686479 is about 1116.4702006578.

The spelling of 1391686479 in words is "one billion, three hundred ninety-one million, six hundred eighty-six thousand, four hundred seventy-nine".