1388225 has 6 divisors (see below), whose sum is σ = 1721430. Its totient is φ = 1110560.

The previous prime is 1388183. The next prime is 1388227. The reversal of 1388225 is 5228831.

It can be written as a sum of positive squares in 3 ways, for example, as 14641 + 1373584 = 121^2 + 1172^2 .

It is not a de Polignac number, because 1388225 - 2⁶ = 1388161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1388227) 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, 27740 + ... + 27789.

It is an arithmetic number, because the mean of its divisors is an integer number (286905).

2^1388225 is an apocalyptic number.

It is an amenable number.

1388225 is a deficient number, since it is larger than the sum of its proper divisors (333205).

1388225 is an equidigital number, since it uses as much as digits as its factorization.

1388225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55539 (or 55534 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 1388225 is about 1178.2296041095. The cubic root of 1388225 is about 111.5543783499.

Subtracting 1388225 from its reverse (5228831), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1388225 in words is "one million, three hundred eighty-eight thousand, two hundred twenty-five".