1323431940 has 24 divisors (see below), whose sum is σ = 3705609600. Its totient is φ = 352915168.

The previous prime is 1323431939. The next prime is 1323431951. The reversal of 1323431940 is 491343231.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1323431898 and 1323431907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11028540 + ... + 11028659.

It is an arithmetic number, because the mean of its divisors is an integer number (154400400).

Almost surely, 2^1323431940 is an apocalyptic number.

1323431940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323431940 is an abundant number, since it is smaller than the sum of its proper divisors (2382177660).

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

1323431940 is a wasteful number, since it uses less digits than its factorization.

1323431940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22057211 (or 22057209 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1323431940 is about 36379.0041095135. The cubic root of 1323431940 is about 1097.9111709453.

The spelling of 1323431940 in words is "one billion, three hundred twenty-three million, four hundred thirty-one thousand, nine hundred forty".