1213605964 has 12 divisors (see below), whose sum is σ = 2124546088. Its totient is φ = 606592800.

The previous prime is 1213605961. The next prime is 1213605977. The reversal of 1213605964 is 4695063121.

It is not an unprimeable number, because it can be changed into a prime (1213605961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39177 + ... + 62944.

Almost surely, 2^1213605964 is an apocalyptic number.

It is an amenable number.

1213605964 is a deficient number, since it is larger than the sum of its proper divisors (910940124).

1213605964 is a wasteful number, since it uses less digits than its factorization.

1213605964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105096 (or 105094 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1213605964 is about 34836.8477908091. The cubic root of 1213605964 is about 1066.6597333317.

The spelling of 1213605964 in words is "one billion, two hundred thirteen million, six hundred five thousand, nine hundred sixty-four".