1213617988 has 24 divisors (see below), whose sum is σ = 2320234560. Its totient is φ = 550852320.

The previous prime is 1213617983. The next prime is 1213618037. The reversal of 1213617988 is 8897163121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1213617983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11745 + ... + 50647.

It is an arithmetic number, because the mean of its divisors is an integer number (96676440).

Almost surely, 2^1213617988 is an apocalyptic number.

It is an amenable number.

1213617988 is a deficient number, since it is larger than the sum of its proper divisors (1106616572).

1213617988 is a wasteful number, since it uses less digits than its factorization.

1213617988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39627 (or 39625 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 1213617988 is about 34837.0203662713. The cubic root of 1213617988 is about 1066.6632560221.

The spelling of 1213617988 in words is "one billion, two hundred thirteen million, six hundred seventeen thousand, nine hundred eighty-eight".