1388745552 has 40 divisors (see below), whose sum is σ = 3590172000. Its totient is φ = 462582400.

The previous prime is 1388745551. The next prime is 1388745557. The reversal of 1388745552 is 2555478831.

It is a super-2 number, since 2×1388745552² = 3857228416399569408, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388745551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62302 + ... + 81602.

It is an arithmetic number, because the mean of its divisors is an integer number (89754300).

Almost surely, 2^1388745552 is an apocalyptic number.

1388745552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1388745552 is an abundant number, since it is smaller than the sum of its proper divisors (2201426448).

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

1388745552 is a wasteful number, since it uses less digits than its factorization.

1388745552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20811 (or 20805 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 48.

The square root of 1388745552 is about 37265.8765092142. The cubic root of 1388745552 is about 1115.6832003753.

The spelling of 1388745552 in words is "one billion, three hundred eighty-eight million, seven hundred forty-five thousand, five hundred fifty-two".