1219913604 has 108 divisors (see below), whose sum is σ = 3863132364. Its totient is φ = 321729408.

The previous prime is 1219913603. The next prime is 1219913627. The reversal of 1219913604 is 4063199121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 497379204 + 722534400 = 22302^2 + 26880^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1219913603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3667 + ... + 49530.

Almost surely, 2^1219913604 is an apocalyptic number.

1219913604 is a gapful number since it is divisible by the number (14) 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 1219913604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931566182).

1219913604 is an abundant number, since it is smaller than the sum of its proper divisors (2643218760).

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

1219913604 is a wasteful number, since it uses less digits than its factorization.

1219913604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53234 (or 53222 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1219913604 is about 34927.2616161073. The cubic root of 1219913604 is about 1068.5045064129.

The spelling of 1219913604 in words is "one billion, two hundred nineteen million, nine hundred thirteen thousand, six hundred four".