1366827721 has 8 divisors (see below), whose sum is σ = 1574389760. Its totient is φ = 1162340928.

The previous prime is 1366827697. The next prime is 1366827751. The reversal of 1366827721 is 1277286631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1366827721 - 2²³ = 1358439113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366827751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767856 + ... + 769633.

It is an arithmetic number, because the mean of its divisors is an integer number (196798720).

Almost surely, 2^1366827721 is an apocalyptic number.

It is an amenable number.

1366827721 is a deficient number, since it is larger than the sum of its proper divisors (207562039).

1366827721 is a wasteful number, since it uses less digits than its factorization.

1366827721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537623.

The product of its digits is 169344, while the sum is 43.

The square root of 1366827721 is about 36970.6332242227. The cubic root of 1366827721 is about 1109.7826376863.

The spelling of 1366827721 in words is "one billion, three hundred sixty-six million, eight hundred twenty-seven thousand, seven hundred twenty-one".