1306438040 has 32 divisors (see below), whose sum is σ = 3007849680. Its totient is φ = 510421632.

The previous prime is 1306438027. The next prime is 1306438079. The reversal of 1306438040 is 408346031.

It is a junction number, because it is equal to n+sod(n) for n = 1306437994 and 1306438012.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 378059 + ... + 381498.

Almost surely, 2^1306438040 is an apocalyptic number.

1306438040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1306438040 is an abundant number, since it is smaller than the sum of its proper divisors (1701411640).

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

1306438040 is a wasteful number, since it uses less digits than its factorization.

1306438040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759611 (or 759607 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1306438040 is about 36144.6820431443. The cubic root of 1306438040 is about 1093.1915660755.

The spelling of 1306438040 in words is "one billion, three hundred six million, four hundred thirty-eight thousand, forty".