1387975552 has 16 divisors (see below), whose sum is σ = 2765107800. Its totient is φ = 693987712.

The previous prime is 1387975483. The next prime is 1387975553. The reversal of 1387975552 is 2555797831.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×1387975552² = 3852952265899409408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1387975552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387975553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5421652 + ... + 5421907.

Almost surely, 2^1387975552 is an apocalyptic number.

It is an amenable number.

1387975552 is a deficient number, since it is larger than the sum of its proper divisors (1377132248).

1387975552 is an equidigital number, since it uses as much as digits as its factorization.

1387975552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10843573 (or 10843561 counting only the distinct ones).

The product of its digits is 2646000, while the sum is 52.

The square root of 1387975552 is about 37255.5439095982. The cubic root of 1387975552 is about 1115.4769627182.

The spelling of 1387975552 in words is "one billion, three hundred eighty-seven million, nine hundred seventy-five thousand, five hundred fifty-two".