1323773440 has 160 divisors (see below), whose sum is σ = 3584100960. Its totient is φ = 464486400.

The previous prime is 1323773413. The next prime is 1323773443. The reversal of 1323773440 is 443773231.

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×1323773440² = 3504752240898867200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1323773396 and 1323773405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323773443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 815830 + ... + 817450.

It is an arithmetic number, because the mean of its divisors is an integer number (22400631).

Almost surely, 2^1323773440 is an apocalyptic number.

1323773440 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 1323773440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792050480).

1323773440 is an abundant number, since it is smaller than the sum of its proper divisors (2260327520).

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

1323773440 is a wasteful number, since it uses less digits than its factorization.

1323773440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 1323773440 is about 36383.6974481704. The cubic root of 1323773440 is about 1098.0055982718.

The spelling of 1323773440 in words is "one billion, three hundred twenty-three million, seven hundred seventy-three thousand, four hundred forty".