1331340402 has 32 divisors (see below), whose sum is σ = 3044156544. Its totient is φ = 380246400.

The previous prime is 1331340379. The next prime is 1331340403. The reversal of 1331340402 is 2040431331.

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

It is not an unprimeable number, because it can be changed into a prime (1331340403) 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, 200902 + ... + 207422.

It is an arithmetic number, because the mean of its divisors is an integer number (95129892).

Almost surely, 2^1331340402 is an apocalyptic number.

1331340402 is an abundant number, since it is smaller than the sum of its proper divisors (1712816142).

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

1331340402 is a wasteful number, since it uses less digits than its factorization.

1331340402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11394.

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

The square root of 1331340402 is about 36487.5376258799. The cubic root of 1331340402 is about 1100.0937666625.

Adding to 1331340402 its reverse (2040431331), we get a palindrome (3371771733).

The spelling of 1331340402 in words is "one billion, three hundred thirty-one million, three hundred forty thousand, four hundred two".