1391225 has 12 divisors (see below), whose sum is σ = 1882320. Its totient is φ = 1011600.

The previous prime is 1391207. The next prime is 1391233. The reversal of 1391225 is 5221931.

It is not a de Polignac number, because 1391225 - 2⁸ = 1390969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1391225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2255 + ... + 2804.

It is an arithmetic number, because the mean of its divisors is an integer number (156860).

2^1391225 is an apocalyptic number.

It is an amenable number.

1391225 is a deficient number, since it is larger than the sum of its proper divisors (491095).

1391225 is a wasteful number, since it uses less digits than its factorization.

1391225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080 (or 5075 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 1391225 is about 1179.5020135634. The cubic root of 1391225 is about 111.6346780975.

It can be divided in two parts, 139122 and 5, that multiplied together give a triangular number (695610 = T₁₁₇₉).

The spelling of 1391225 in words is "one million, three hundred ninety-one thousand, two hundred twenty-five".