1213723204 has 12 divisors (see below), whose sum is σ = 2124263484. Its totient is φ = 606790784.

The previous prime is 1213723187. The next prime is 1213723207. The reversal of 1213723204 is 4023273121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 340402500 + 873320704 = 18450^2 + 29552^2 .

It is not an unprimeable number, because it can be changed into a prime (1213723207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47712 + ... + 68584.

It is an arithmetic number, because the mean of its divisors is an integer number (177021957).

Almost surely, 2^1213723204 is an apocalyptic number.

It is an amenable number.

1213723204 is a deficient number, since it is larger than the sum of its proper divisors (910540280).

1213723204 is a wasteful number, since it uses less digits than its factorization.

1213723204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35414 (or 35412 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1213723204 is about 34838.5304512116. The cubic root of 1213723204 is about 1066.6940803284.

Adding to 1213723204 its reverse (4023273121), we get a palindrome (5236996325).

The spelling of 1213723204 in words is "one billion, two hundred thirteen million, seven hundred twenty-three thousand, two hundred four".