1366421143 has 4 divisors (see below), whose sum is σ = 1392202728. Its totient is φ = 1340639560.

The previous prime is 1366421123. The next prime is 1366421153. The reversal of 1366421143 is 3411246631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366421143 is a prime.

It is a super-3 number, since 3×1366421143³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366421113) 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, 12890713 + ... + 12890818.

It is an arithmetic number, because the mean of its divisors is an integer number (348050682).

Almost surely, 2^1366421143 is an apocalyptic number.

1366421143 is a deficient number, since it is larger than the sum of its proper divisors (25781585).

1366421143 is an equidigital number, since it uses as much as digits as its factorization.

1366421143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25781584.

The product of its digits is 10368, while the sum is 31.

The square root of 1366421143 is about 36965.1341536860. The cubic root of 1366421143 is about 1109.6725877399.

Adding to 1366421143 its reverse (3411246631), we get a palindrome (4777667774).

The spelling of 1366421143 in words is "one billion, three hundred sixty-six million, four hundred twenty-one thousand, one hundred forty-three".