1321402340 has 24 divisors (see below), whose sum is σ = 2779369152. Its totient is φ = 527718240.

The previous prime is 1321402339. The next prime is 1321402343. The reversal of 1321402340 is 432041231.

It is a super-2 number, since 2×1321402340² = 3492208288314951200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1321402343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39734 + ... + 64973.

It is an arithmetic number, because the mean of its divisors is an integer number (115807048).

Almost surely, 2^1321402340 is an apocalyptic number.

1321402340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321402340 is an abundant number, since it is smaller than the sum of its proper divisors (1457966812).

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

1321402340 is a wasteful number, since it uses less digits than its factorization.

1321402340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105347 (or 105345 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1321402340 is about 36351.0981952403. The cubic root of 1321402340 is about 1097.3496358119.

Adding to 1321402340 its reverse (432041231), we get a palindrome (1753443571).

The spelling of 1321402340 in words is "one billion, three hundred twenty-one million, four hundred two thousand, three hundred forty".