1383661945 has 16 divisors (see below), whose sum is σ = 1742290560. Its totient is φ = 1052871424.

The previous prime is 1383661931. The next prime is 1383662003. The reversal of 1383661945 is 5491663831.

It is a cyclic number.

It is not a de Polignac number, because 1383661945 - 2⁷ = 1383661817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1383661895 and 1383661904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13024 + ... + 54193.

It is an arithmetic number, because the mean of its divisors is an integer number (108893160).

Almost surely, 2^1383661945 is an apocalyptic number.

It is an amenable number.

1383661945 is a deficient number, since it is larger than the sum of its proper divisors (358628615).

1383661945 is a wasteful number, since it uses less digits than its factorization.

1383661945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67424.

The product of its digits is 466560, while the sum is 46.

The square root of 1383661945 is about 37197.6067106474. The cubic root of 1383661945 is about 1114.3201886073.

The spelling of 1383661945 in words is "one billion, three hundred eighty-three million, six hundred sixty-one thousand, nine hundred forty-five".