1323400440 has 64 divisors (see below), whose sum is σ = 3989093760. Its totient is φ = 351227520.

The previous prime is 1323400417. The next prime is 1323400469. The reversal of 1323400440 is 440043231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814 + ... + 51453.

It is an arithmetic number, because the mean of its divisors is an integer number (62329590).

Almost surely, 2^1323400440 is an apocalyptic number.

1323400440 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 1323400440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994546880).

1323400440 is an abundant number, since it is smaller than the sum of its proper divisors (2665693320).

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

1323400440 is a wasteful number, since it uses less digits than its factorization.

1323400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52492 (or 52488 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1323400440 is about 36378.5711649042. The cubic root of 1323400440 is about 1097.9024601394.

Adding to 1323400440 its reverse (440043231), we get a palindrome (1763443671).

The spelling of 1323400440 in words is "one billion, three hundred twenty-three million, four hundred thousand, four hundred forty".