1220971600 has 60 divisors (see below), whose sum is σ = 2988783036. Its totient is φ = 479165440.

The previous prime is 1220971589. The next prime is 1220971639. The reversal of 1220971600 is 61790221.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 46949904 + 1174021696 = 6852^2 + 34264^2 .

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 in 11 ways as a sum of consecutive naturals, for example, 7597 + ... + 49996.

Almost surely, 2^1220971600 is an apocalyptic number.

1220971600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220971600 is an abundant number, since it is smaller than the sum of its proper divisors (1767811436).

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

1220971600 is a wasteful number, since it uses less digits than its factorization.

1220971600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57664 (or 57653 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1220971600 is about 34942.4040386462. The cubic root of 1220971600 is about 1068.8133115715.

The spelling of 1220971600 in words is "one billion, two hundred twenty million, nine hundred seventy-one thousand, six hundred".