1320647945 has 16 divisors (see below), whose sum is σ = 1595138880. Its totient is φ = 1049630400.

The previous prime is 1320647929. The next prime is 1320648001. The reversal of 1320647945 is 5497460231.

It is not a de Polignac number, because 1320647945 - 2⁴ = 1320647929 is a prime.

It is a super-2 number, since 2×1320647945² = 3488221989265446050, which contains 22 as substring.

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, 1127210 + ... + 1128380.

It is an arithmetic number, because the mean of its divisors is an integer number (99696180).

Almost surely, 2^1320647945 is an apocalyptic number.

It is an amenable number.

1320647945 is a deficient number, since it is larger than the sum of its proper divisors (274490935).

1320647945 is a wasteful number, since it uses less digits than its factorization.

1320647945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1320647945 is about 36340.7202047510. The cubic root of 1320647945 is about 1097.1407686507.

The spelling of 1320647945 in words is "one billion, three hundred twenty million, six hundred forty-seven thousand, nine hundred forty-five".