1312203402 has 96 divisors (see below), whose sum is σ = 3064449024. Its totient is φ = 420390000.

The previous prime is 1312203379. The next prime is 1312203419. The reversal of 1312203402 is 2043022131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3781393 + ... + 3781739.

It is an arithmetic number, because the mean of its divisors is an integer number (31921344).

Almost surely, 2^1312203402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312203402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532224512).

1312203402 is an abundant number, since it is smaller than the sum of its proper divisors (1752245622).

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

1312203402 is a wasteful number, since it uses less digits than its factorization.

1312203402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1312203402 is about 36224.3481928937. The cubic root of 1312203402 is about 1094.7973053227.

Adding to 1312203402 its reverse (2043022131), we get a palindrome (3355225533).

The spelling of 1312203402 in words is "one billion, three hundred twelve million, two hundred three thousand, four hundred two".