1212166426 has 8 divisors (see below), whose sum is σ = 1819001844. Its totient is φ = 605832480.

The previous prime is 1212166409. The next prime is 1212166463. The reversal of 1212166426 is 6246612121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1193633401 + 18533025 = 34549^2 + 4305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1212166426² = 2938694888643226952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119265 + ... + 129028.

Almost surely, 2^1212166426 is an apocalyptic number.

1212166426 is a deficient number, since it is larger than the sum of its proper divisors (606835418).

1212166426 is a wasteful number, since it uses less digits than its factorization.

1212166426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250736.

The product of its digits is 6912, while the sum is 31.

The square root of 1212166426 is about 34816.1805199824. The cubic root of 1212166426 is about 1066.2378213374.

Adding to 1212166426 its reverse (6246612121), we get a palindrome (7458778547).

The spelling of 1212166426 in words is "one billion, two hundred twelve million, one hundred sixty-six thousand, four hundred twenty-six".