1312203340 has 144 divisors (see below), whose sum is σ = 3383009280. Its totient is φ = 425658240.

The previous prime is 1312203329. The next prime is 1312203353. The reversal of 1312203340 is 433022131.

1312203340 = T₇₄₄₉ + T₇₄₅₀ + ... + T₇₄₉₅.

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, 1427401 + ... + 1428319.

It is an arithmetic number, because the mean of its divisors is an integer number (23493120).

Almost surely, 2^1312203340 is an apocalyptic number.

1312203340 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 1312203340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1691504640).

1312203340 is an abundant number, since it is smaller than the sum of its proper divisors (2070805940).

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

1312203340 is a wasteful number, since it uses less digits than its factorization.

1312203340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1312203340 is about 36224.3473371157. The cubic root of 1312203340 is about 1094.7972880801.

Adding to 1312203340 its reverse (433022131), we get a palindrome (1745225471).

The spelling of 1312203340 in words is "one billion, three hundred twelve million, two hundred three thousand, three hundred forty".