1388161272 has 32 divisors (see below), whose sum is σ = 3555049680. Its totient is φ = 451434240.

The previous prime is 1388161259. The next prime is 1388161283. The reversal of 1388161272 is 2721618831.

It is a self number, because there is not a number n which added to its sum of digits gives 1388161272.

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, 704383 + ... + 706350.

Almost surely, 2^1388161272 is an apocalyptic number.

1388161272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388161272 is an abundant number, since it is smaller than the sum of its proper divisors (2166888408).

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

1388161272 is a wasteful number, since it uses less digits than its factorization.

1388161272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410783 (or 1410779 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 1388161272 is about 37258.0363411707. The cubic root of 1388161272 is about 1115.5267131483.

The spelling of 1388161272 in words is "one billion, three hundred eighty-eight million, one hundred sixty-one thousand, two hundred seventy-two".