1388340636 has 24 divisors (see below), whose sum is σ = 3244886400. Its totient is φ = 462005232.

The previous prime is 1388340619. The next prime is 1388340641. The reversal of 1388340636 is 6360438831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89386 + ... + 103761.

It is an arithmetic number, because the mean of its divisors is an integer number (135203600).

Almost surely, 2^1388340636 is an apocalyptic number.

It is an amenable number.

1388340636 is an abundant number, since it is smaller than the sum of its proper divisors (1856545764).

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

1388340636 is a wasteful number, since it uses less digits than its factorization.

1388340636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193753 (or 193751 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 1388340636 is about 37260.4433145930. The cubic root of 1388340636 is about 1115.5747567295.

The spelling of 1388340636 in words is "one billion, three hundred eighty-eight million, three hundred forty thousand, six hundred thirty-six".