1345023540 has 216 divisors, whose sum is σ = 4813328520. Its totient is φ = 303077376.

The previous prime is 1345023517. The next prime is 1345023541. The reversal of 1345023540 is 453205431.

It can be written as a sum of positive squares in 4 ways, for example, as 394657956 + 950365584 = 19866^2 + 30828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345023541) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 642816 + ... + 644904.

Almost surely, 2^1345023540 is an apocalyptic number.

1345023540 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 1345023540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2406664260).

1345023540 is an abundant number, since it is smaller than the sum of its proper divisors (3468304980).

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

1345023540 is a wasteful number, since it uses less digits than its factorization.

1345023540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191 (or 2179 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1345023540 is about 36674.5625740785. The cubic root of 1345023540 is about 1103.8497452254.

Adding to 1345023540 its reverse (453205431), we get a palindrome (1798228971).

The spelling of 1345023540 in words is "one billion, three hundred forty-five million, twenty-three thousand, five hundred forty".