1221988346 has 8 divisors (see below), whose sum is σ = 1851879540. Its totient is φ = 604695168.

The previous prime is 1221988291. The next prime is 1221988357. The reversal of 1221988346 is 6438891221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1210692025 + 11296321 = 34795^2 + 3361^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1221988297 and 1221988306.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3149261 + ... + 3149648.

Almost surely, 2^1221988346 is an apocalyptic number.

1221988346 is a deficient number, since it is larger than the sum of its proper divisors (629891194).

1221988346 is an equidigital number, since it uses as much as digits as its factorization.

1221988346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6299008.

The product of its digits is 165888, while the sum is 44.

The square root of 1221988346 is about 34956.9498955501. The cubic root of 1221988346 is about 1069.1099087381.

The spelling of 1221988346 in words is "one billion, two hundred twenty-one million, nine hundred eighty-eight thousand, three hundred forty-six".