1366894639 has 16 divisors (see below), whose sum is σ = 1581638400. Its totient is φ = 1167487360.

The previous prime is 1366894619. The next prime is 1366894643. The reversal of 1366894639 is 9364986631.

It is a cyclic number.

It is not a de Polignac number, because 1366894639 - 2¹³ = 1366886447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366894639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366894619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105912 + ... + 118114.

It is an arithmetic number, because the mean of its divisors is an integer number (98852400).

Almost surely, 2^1366894639 is an apocalyptic number.

1366894639 is a deficient number, since it is larger than the sum of its proper divisors (214743761).

1366894639 is a wasteful number, since it uses less digits than its factorization.

1366894639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830.

The product of its digits is 5038848, while the sum is 55.

The square root of 1366894639 is about 36971.5382287510. The cubic root of 1366894639 is about 1109.8007485332.

The spelling of 1366894639 in words is "one billion, three hundred sixty-six million, eight hundred ninety-four thousand, six hundred thirty-nine".