1323431004 has 72 divisors (see below), whose sum is σ = 3597205248. Its totient is φ = 377593440.

The previous prime is 1323430961. The next prime is 1323431023. The reversal of 1323431004 is 4001343231.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640477 + ... + 642539.

It is an arithmetic number, because the mean of its divisors is an integer number (49961184).

Almost surely, 2^1323431004 is an apocalyptic number.

1323431004 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 1323431004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798602624).

1323431004 is an abundant number, since it is smaller than the sum of its proper divisors (2273774244).

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

1323431004 is a wasteful number, since it uses less digits than its factorization.

1323431004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175 (or 3166 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1323431004 is about 36378.9912449480. The cubic root of 1323431004 is about 1097.9109121119.

Adding to 1323431004 its reverse (4001343231), we get a palindrome (5324774235).

The spelling of 1323431004 in words is "one billion, three hundred twenty-three million, four hundred thirty-one thousand, four".