1366783949 has 8 divisors (see below), whose sum is σ = 1415620920. Its totient is φ = 1319629920.

The previous prime is 1366783937. The next prime is 1366783963. The reversal of 1366783949 is 9493876631.

It can be written as a sum of positive squares in 4 ways, for example, as 40513225 + 1326270724 = 6365^2 + 36418^2 .

It is not a de Polignac number, because 1366783949 - 2⁴ = 1366783933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1366783894 and 1366783903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366783549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3632 + ... + 52409.

It is an arithmetic number, because the mean of its divisors is an integer number (176952615).

Almost surely, 2^1366783949 is an apocalyptic number.

It is an amenable number.

1366783949 is a deficient number, since it is larger than the sum of its proper divisors (48836971).

1366783949 is an frugal number, since it uses more digits than its factorization.

1366783949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56128 (or 56070 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 56.

The square root of 1366783949 is about 36970.0412361144. The cubic root of 1366783949 is about 1109.7707908082.

The spelling of 1366783949 in words is "one billion, three hundred sixty-six million, seven hundred eighty-three thousand, nine hundred forty-nine".