1229947136 has 72 divisors (see below), whose sum is σ = 2735558784. Its totient is φ = 547112960.

The previous prime is 1229947123. The next prime is 1229947141. The reversal of 1229947136 is 6317499221.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127706 + ... + 136998.

It is an arithmetic number, because the mean of its divisors is an integer number (37993872).

Almost surely, 2^1229947136 is an apocalyptic number.

1229947136 is a gapful number since it is divisible by the number (16) 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 1229947136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367779392).

1229947136 is an abundant number, since it is smaller than the sum of its proper divisors (1505611648).

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

1229947136 is an equidigital number, since it uses as much as digits as its factorization.

1229947136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367 (or 9353 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 1229947136 is about 35070.6021619247. The cubic root of 1229947136 is about 1071.4259196954.

The spelling of 1229947136 in words is "one billion, two hundred twenty-nine million, nine hundred forty-seven thousand, one hundred thirty-six".