1366020287 has 4 divisors (see below), whose sum is σ = 1375991376. Its totient is φ = 1356049200.

The previous prime is 1366020233. The next prime is 1366020289. The reversal of 1366020287 is 7820206631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7820206631 = 83 ⋅94219357.

It is a cyclic number.

It is not a de Polignac number, because 1366020287 - 2⁶ = 1366020223 is a prime.

It is a super-3 number, since 3×1366020287³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366020289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4985339 + ... + 4985612.

It is an arithmetic number, because the mean of its divisors is an integer number (343997844).

Almost surely, 2^1366020287 is an apocalyptic number.

1366020287 is a deficient number, since it is larger than the sum of its proper divisors (9971089).

1366020287 is an equidigital number, since it uses as much as digits as its factorization.

1366020287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9971088.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1366020287 is about 36959.7116736589. The cubic root of 1366020287 is about 1109.5640652145.

The spelling of 1366020287 in words is "one billion, three hundred sixty-six million, twenty thousand, two hundred eighty-seven".