1213231404 has 96 divisors (see below), whose sum is σ = 3535773696. Its totient is φ = 314556480.

The previous prime is 1213231403. The next prime is 1213231417. The reversal of 1213231404 is 4041323121.

It is a super-2 number, since 2×1213231404² = 2943860879303622432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1213231403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 815149 + ... + 816635.

It is an arithmetic number, because the mean of its divisors is an integer number (36830976).

Almost surely, 2^1213231404 is an apocalyptic number.

1213231404 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 1213231404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1767886848).

1213231404 is an abundant number, since it is smaller than the sum of its proper divisors (2322542292).

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

1213231404 is a wasteful number, since it uses less digits than its factorization.

1213231404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1213231404 is about 34831.4714590125. The cubic root of 1213231404 is about 1066.5499862388.

Adding to 1213231404 its reverse (4041323121), we get a palindrome (5254554525).

The spelling of 1213231404 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, four hundred four".