1340634638 has 16 divisors (see below), whose sum is σ = 2330601984. Its totient is φ = 566464920.

The previous prime is 1340634619. The next prime is 1340634643. The reversal of 1340634638 is 8364360431.

It is a Curzon number.

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, 673370 + ... + 675357.

It is an arithmetic number, because the mean of its divisors is an integer number (145662624).

Almost surely, 2^1340634638 is an apocalyptic number.

1340634638 is a deficient number, since it is larger than the sum of its proper divisors (989967346).

1340634638 is a wasteful number, since it uses less digits than its factorization.

1340634638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348807.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 1340634638 is about 36614.6779038134. The cubic root of 1340634638 is about 1102.6477916789.

The spelling of 1340634638 in words is "one billion, three hundred forty million, six hundred thirty-four thousand, six hundred thirty-eight".