1225405 has 8 divisors (see below), whose sum is σ = 1548000. Its totient is φ = 928656.

The previous prime is 1225397. The next prime is 1225409. The reversal of 1225405 is 5045221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225405 - 2³ = 1225397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6355 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (193500).

2^1225405 is an apocalyptic number.

It is an amenable number.

1225405 is a deficient number, since it is larger than the sum of its proper divisors (322595).

1225405 is a wasteful number, since it uses less digits than its factorization.

1225405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12923.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1225405 is about 1106.9801262895. The cubic root of 1225405 is about 107.0105384560.

The spelling of 1225405 in words is "one million, two hundred twenty-five thousand, four hundred five".