1211987968 has 24 divisors (see below), whose sum is σ = 2423388240. Its totient is φ = 605992960.

The previous prime is 1211987957. The next prime is 1211987983. The reversal of 1211987968 is 8697891121.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 293848 + ... + 297943.

It is an arithmetic number, because the mean of its divisors is an integer number (100974510).

Almost surely, 2^1211987968 is an apocalyptic number.

It is an amenable number.

1211987968 is a deficient number, since it is larger than the sum of its proper divisors (1211400272).

1211987968 is an frugal number, since it uses more digits than its factorization.

1211987968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591813 (or 591793 counting only the distinct ones).

The product of its digits is 435456, while the sum is 52.

The square root of 1211987968 is about 34813.6175655447. The cubic root of 1211987968 is about 1066.1854940871.

The spelling of 1211987968 in words is "one billion, two hundred eleven million, nine hundred eighty-seven thousand, nine hundred sixty-eight".