1388278556 has 12 divisors (see below), whose sum is σ = 2776557168. Its totient is φ = 594976512.

The previous prime is 1388278553. The next prime is 1388278579. The reversal of 1388278556 is 6558728831.

1388278556 is an admirable number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1388278498 and 1388278507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388278553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24790661 + ... + 24790716.

It is an arithmetic number, because the mean of its divisors is an integer number (231379764).

Almost surely, 2^1388278556 is an apocalyptic number.

It is an amenable number.

1388278556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1388278556 is a wasteful number, since it uses less digits than its factorization.

1388278556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49581388 (or 49581386 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 53.

The square root of 1388278556 is about 37259.6102502428. The cubic root of 1388278556 is about 1115.5581287466.

The spelling of 1388278556 in words is "one billion, three hundred eighty-eight million, two hundred seventy-eight thousand, five hundred fifty-six".