1381225 has 6 divisors (see below), whose sum is σ = 1712750. Its totient is φ = 1104960.

The previous prime is 1381217. The next prime is 1381229. The reversal of 1381225 is 5221831.

It can be written as a sum of positive squares in 3 ways, for example, as 162409 + 1218816 = 403^2 + 1104^2 .

It is not a de Polignac number, because 1381225 - 2³ = 1381217 is a prime.

1381225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1381196 and 1381205.

It is not an unprimeable number, because it can be changed into a prime (1381229) 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, 27600 + ... + 27649.

2^1381225 is an apocalyptic number.

It is an amenable number.

1381225 is a deficient number, since it is larger than the sum of its proper divisors (331525).

1381225 is an equidigital number, since it uses as much as digits as its factorization.

1381225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55259 (or 55254 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1381225 is about 1175.2552914154. The cubic root of 1381225 is about 111.3665613307.

Subtracting 1381225 from its reverse (5221831), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1381225 in words is "one million, three hundred eighty-one thousand, two hundred twenty-five".