1229847840 has 384 divisors, whose sum is σ = 4724697600. Its totient is φ = 296939520.

The previous prime is 1229847809. The next prime is 1229847851. The reversal of 1229847840 is 487489221.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3425581 + ... + 3425939.

It is an arithmetic number, because the mean of its divisors is an integer number (12303900).

Almost surely, 2^1229847840 is an apocalyptic number.

1229847840 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 1229847840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2362348800).

1229847840 is an abundant number, since it is smaller than the sum of its proper divisors (3494849760).

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

1229847840 is a wasteful number, since it uses less digits than its factorization.

1229847840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1229847840 is about 35069.1864747388. The cubic root of 1229847840 is about 1071.3970861605.

The spelling of 1229847840 in words is "one billion, two hundred twenty-nine million, eight hundred forty-seven thousand, eight hundred forty".