1388637513 has 20 divisors (see below), whose sum is σ = 2118526080. Its totient is φ = 906058872.

The previous prime is 1388637493. The next prime is 1388637517. The reversal of 1388637513 is 3157368831.

1388637513 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 637 + 5 + 1 + 3 = 666.

It is not a de Polignac number, because 1388637513 - 2¹⁸ = 1388375369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388637517) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 178573 + ... + 186186.

It is an arithmetic number, because the mean of its divisors is an integer number (105926304).

Almost surely, 2^1388637513 is an apocalyptic number.

It is an amenable number.

1388637513 is a deficient number, since it is larger than the sum of its proper divisors (729888567).

1388637513 is an equidigital number, since it uses as much as digits as its factorization.

1388637513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364818 (or 364809 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1388637513 is about 37264.4269109294. The cubic root of 1388637513 is about 1115.6542676878.

The spelling of 1388637513 in words is "one billion, three hundred eighty-eight million, six hundred thirty-seven thousand, five hundred thirteen".