1229801720 has 128 divisors (see below), whose sum is σ = 3377341440. Its totient is φ = 393845760.

The previous prime is 1229801719. The next prime is 1229801731. The reversal of 1229801720 is 271089221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274700 + ... + 279140.

It is an arithmetic number, because the mean of its divisors is an integer number (26385480).

Almost surely, 2^1229801720 is an apocalyptic number.

1229801720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229801720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1688670720).

1229801720 is an abundant number, since it is smaller than the sum of its proper divisors (2147539720).

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

1229801720 is a wasteful number, since it uses less digits than its factorization.

1229801720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4525 (or 4521 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1229801720 is about 35068.5289112617. The cubic root of 1229801720 is about 1071.3836933245.

The spelling of 1229801720 in words is "one billion, two hundred twenty-nine million, eight hundred one thousand, seven hundred twenty".