1229805420 has 24 divisors (see below), whose sum is σ = 3443455344. Its totient is φ = 327948096.

The previous prime is 1229805397. The next prime is 1229805443. The reversal of 1229805420 is 245089221.

It is an interprime number because it is at equal distance from previous prime (1229805397) and next prime (1229805443).

It is a super-2 number, since 2×1229805420² = 3024842742122752800, which contains 22 as substring.

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, 10248319 + ... + 10248438.

It is an arithmetic number, because the mean of its divisors is an integer number (143477306).

Almost surely, 2^1229805420 is an apocalyptic number.

1229805420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1229805420 is an abundant number, since it is smaller than the sum of its proper divisors (2213649924).

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

1229805420 is a wasteful number, since it uses less digits than its factorization.

1229805420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20496769 (or 20496767 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1229805420 is about 35068.5816650745. The cubic root of 1229805420 is about 1071.3847677838.

The spelling of 1229805420 in words is "one billion, two hundred twenty-nine million, eight hundred five thousand, four hundred twenty".