1229686920 has 768 divisors, whose sum is σ = 5434490880. Its totient is φ = 242611200.

The previous prime is 1229686919. The next prime is 1229686933. The reversal of 1229686920 is 296869221.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 191 ways as a sum of consecutive naturals, for example, 23201614 + ... + 23201666.

It is an arithmetic number, because the mean of its divisors is an integer number (7076160).

Almost surely, 2^1229686920 is an apocalyptic number.

1229686920 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 1229686920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2717245440).

1229686920 is an abundant number, since it is smaller than the sum of its proper divisors (4204803960).

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

1229686920 is a wasteful number, since it uses less digits than its factorization.

1229686920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1229686920 is about 35066.8920778560. The cubic root of 1229686920 is about 1071.3503549759.

The spelling of 1229686920 in words is "one billion, two hundred twenty-nine million, six hundred eighty-six thousand, nine hundred twenty".