1388147225 has 6 divisors (see below), whose sum is σ = 1721302590. Its totient is φ = 1110517760.

The previous prime is 1388147219. The next prime is 1388147231. The reversal of 1388147225 is 5227418831.

It is an interprime number because it is at equal distance from previous prime (1388147219) and next prime (1388147231).

It can be written as a sum of positive squares in 3 ways, for example, as 22401289 + 1365745936 = 4733^2 + 36956^2 .

It is not a de Polignac number, because 1388147225 - 2⁶ = 1388147161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27762920 + ... + 27762969.

It is an arithmetic number, because the mean of its divisors is an integer number (286883765).

Almost surely, 2^1388147225 is an apocalyptic number.

It is an amenable number.

1388147225 is a deficient number, since it is larger than the sum of its proper divisors (333155365).

1388147225 is an equidigital number, since it uses as much as digits as its factorization.

1388147225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55525899 (or 55525894 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 1388147225 is about 37257.8478310275. The cubic root of 1388147225 is about 1115.5229504115.

The spelling of 1388147225 in words is "one billion, three hundred eighty-eight million, one hundred forty-seven thousand, two hundred twenty-five".