1379686491 has 12 divisors (see below), whose sum is σ = 1993742400. Its totient is φ = 919393200.

The previous prime is 1379686453. The next prime is 1379686499. The reversal of 1379686491 is 1946869731.

1379686491 is a `hidden beast` number, since 1 + 3 + 79 + 6 + 86 + 491 = 666.

It is not a de Polignac number, because 1379686491 - 2¹⁴ = 1379670107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1379686499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10360 + ... + 53541.

It is an arithmetic number, because the mean of its divisors is an integer number (166145200).

Almost surely, 2^1379686491 is an apocalyptic number.

1379686491 is a deficient number, since it is larger than the sum of its proper divisors (614055909).

1379686491 is a wasteful number, since it uses less digits than its factorization.

1379686491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66306 (or 66303 counting only the distinct ones).

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

The square root of 1379686491 is about 37144.1313130352. The cubic root of 1379686491 is about 1113.2519657288.

The spelling of 1379686491 in words is "one billion, three hundred seventy-nine million, six hundred eighty-six thousand, four hundred ninety-one".