1212115700 has 18 divisors (see below), whose sum is σ = 2630291286. Its totient is φ = 484846240.

The previous prime is 1212115679. The next prime is 1212115703. The reversal of 1212115700 is 75112121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 32330596 + 1179785104 = 5686^2 + 34348^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212115703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6060479 + ... + 6060678.

Almost surely, 2^1212115700 is an apocalyptic number.

1212115700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212115700 is an abundant number, since it is smaller than the sum of its proper divisors (1418175586).

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

1212115700 is a wasteful number, since it uses less digits than its factorization.

1212115700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121171 (or 12121164 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1212115700 is about 34815.4520292355. The cubic root of 1212115700 is about 1066.2229480402. Note that the first 3 decimals are identical.

Adding to 1212115700 its reverse (75112121), we get a palindrome (1287227821).

The spelling of 1212115700 in words is "one billion, two hundred twelve million, one hundred fifteen thousand, seven hundred".