1388727936 has 128 divisors (see below), whose sum is σ = 4314600000. Its totient is φ = 438524928.

The previous prime is 1388727929. The next prime is 1388727997. The reversal of 1388727936 is 6397278831.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55090 + ... + 76238.

Almost surely, 2^1388727936 is an apocalyptic number.

1388727936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388727936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2157300000).

1388727936 is an abundant number, since it is smaller than the sum of its proper divisors (2925872064).

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

1388727936 is a wasteful number, since it uses less digits than its factorization.

1388727936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21191 (or 21173 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 1388727936 is about 37265.6401528271. The cubic root of 1388727936 is about 1115.6784829384.

The spelling of 1388727936 in words is "one billion, three hundred eighty-eight million, seven hundred twenty-seven thousand, nine hundred thirty-six".