1388889025 has 24 divisors (see below), whose sum is σ = 1789227000. Its totient is φ = 1068211200.

The previous prime is 1388889013. The next prime is 1388889031. The reversal of 1388889025 is 5209888831.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 211644304 + 1177244721 = 14548^2 + 34311^2 .

It is not a de Polignac number, because 1388889025 - 2¹³ = 1388880833 is a prime.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 170751 + ... + 178699.

It is an arithmetic number, because the mean of its divisors is an integer number (74551125).

Almost surely, 2^1388889025 is an apocalyptic number.

It is an amenable number.

1388889025 is a deficient number, since it is larger than the sum of its proper divisors (400337975).

1388889025 is a wasteful number, since it uses less digits than its factorization.

1388889025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229 (or 8224 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The square root of 1388889025 is about 37267.8014511186. The cubic root of 1388889025 is about 1115.7216199172.

The spelling of 1388889025 in words is "one billion, three hundred eighty-eight million, eight hundred eighty-nine thousand, twenty-five".