1388530025 has 6 divisors (see below), whose sum is σ = 1721777262. Its totient is φ = 1110824000.

The previous prime is 1388530001. The next prime is 1388530027. The reversal of 1388530025 is 5200358831.

It can be written as a sum of positive squares in 3 ways, for example, as 23892544 + 1364637481 = 4888^2 + 36941^2 .

It is not a de Polignac number, because 1388530025 - 2¹⁶ = 1388464489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1388530027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27770576 + ... + 27770625.

It is an arithmetic number, because the mean of its divisors is an integer number (286962877).

Almost surely, 2^1388530025 is an apocalyptic number.

It is an amenable number.

1388530025 is a deficient number, since it is larger than the sum of its proper divisors (333247237).

1388530025 is an equidigital number, since it uses as much as digits as its factorization.

1388530025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55541211 (or 55541206 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1388530025 is about 37262.9846496493. The cubic root of 1388530025 is about 1115.6254810680.

Adding to 1388530025 its reverse (5200358831), we get a palindrome (6588888856).

The spelling of 1388530025 in words is "one billion, three hundred eighty-eight million, five hundred thirty thousand, twenty-five".