1213816972 has 12 divisors (see below), whose sum is σ = 2175989256. Its totient is φ = 592105760.

The previous prime is 1213816939. The next prime is 1213816987. The reversal of 1213816972 is 2796183121.

It is an unprimeable number.

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, 3700498 + ... + 3700825.

It is an arithmetic number, because the mean of its divisors is an integer number (181332438).

Almost surely, 2^1213816972 is an apocalyptic number.

It is an amenable number.

1213816972 is a deficient number, since it is larger than the sum of its proper divisors (962172284).

1213816972 is a wasteful number, since it uses less digits than its factorization.

1213816972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7401368 (or 7401366 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 1213816972 is about 34839.8761765882. The cubic root of 1213816972 is about 1066.7215493028.

The spelling of 1213816972 in words is "one billion, two hundred thirteen million, eight hundred sixteen thousand, nine hundred seventy-two".