1388385552 has 40 divisors (see below), whose sum is σ = 3592170880. Its totient is φ = 462084480.

The previous prime is 1388385511. The next prime is 1388385577. The reversal of 1388385552 is 2555838831.

It is a super-2 number, since 2×1388385552² = 3855228882004689408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9849 + ... + 53607.

It is an arithmetic number, because the mean of its divisors is an integer number (89804272).

Almost surely, 2^1388385552 is an apocalyptic number.

1388385552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388385552 is an abundant number, since it is smaller than the sum of its proper divisors (2203785328).

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

1388385552 is a wasteful number, since it uses less digits than its factorization.

1388385552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44431 (or 44425 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The square root of 1388385552 is about 37261.0460400671. The cubic root of 1388385552 is about 1115.5867870661.

The spelling of 1388385552 in words is "one billion, three hundred eighty-eight million, three hundred eighty-five thousand, five hundred fifty-two".