1211868738 has 12 divisors (see below), whose sum is σ = 2625715638. Its totient is φ = 403956240.

The previous prime is 1211868677. The next prime is 1211868743. The reversal of 1211868738 is 8378681121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 793379889 + 418488849 = 28167^2 + 20457^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211868693 and 1211868702.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 33663003 + ... + 33663038.

Almost surely, 2^1211868738 is an apocalyptic number.

1211868738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1211868738 is an abundant number, since it is smaller than the sum of its proper divisors (1413846900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211868738 is a wasteful number, since it uses less digits than its factorization.

1211868738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67326049 (or 67326046 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1211868738 is about 34811.9051187952. The cubic root of 1211868738 is about 1066.1505307408.

The spelling of 1211868738 in words is "one billion, two hundred eleven million, eight hundred sixty-eight thousand, seven hundred thirty-eight".