1340273538 has 18 divisors (see below), whose sum is σ = 2904262569. Its totient is φ = 446706072.

The previous prime is 1340273513. The next prime is 1340273563. The reversal of 1340273538 is 8353720431.

1340273538 is a `hidden beast` number, since 13 + 40 + 2 + 73 + 538 = 666.

It is an interprime number because it is at equal distance from previous prime (1340273513) and next prime (1340273563).

It can be written as a sum of positive squares in 2 ways, for example, as 1234327689 + 105945849 = 35133^2 + 10293^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25887.

It is a super-3 number, since 3×1340273538³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 151008 + ... + 159636.

Almost surely, 2^1340273538 is an apocalyptic number.

1340273538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1340273538 is an abundant number, since it is smaller than the sum of its proper divisors (1563989031).

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

1340273538 is an frugal number, since it uses more digits than its factorization.

1340273538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17266 (or 8634 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 1340273538 is about 36609.7464891523. The cubic root of 1340273538 is about 1102.5487833783.

Adding to 1340273538 its reverse (8353720431), we get a palindrome (9693993969).

The spelling of 1340273538 in words is "one billion, three hundred forty million, two hundred seventy-three thousand, five hundred thirty-eight".