1223405000 has 160 divisors (see below), whose sum is σ = 3125093400. Its totient is φ = 446976000.

The previous prime is 1223404993. The next prime is 1223405023. The reversal of 1223405000 is 5043221.

It can be written as a sum of positive squares in 20 ways, for example, as 222188836 + 1001216164 = 14906^2 + 31642^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 1223405000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3144806 + ... + 3145194.

Almost surely, 2^1223405000 is an apocalyptic number.

1223405000 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 1223405000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562546700).

1223405000 is an abundant number, since it is smaller than the sum of its proper divisors (1901688400).

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

1223405000 is a wasteful number, since it uses less digits than its factorization.

1223405000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1223405000 is about 34977.2068638992. The cubic root of 1223405000 is about 1069.5228897437.

Adding to 1223405000 its reverse (5043221), we get a palindrome (1228448221).

The spelling of 1223405000 in words is "one billion, two hundred twenty-three million, four hundred five thousand".