1225905 has 8 divisors (see below), whose sum is σ = 1961472. Its totient is φ = 653808.

The previous prime is 1225897. The next prime is 1225907. The reversal of 1225905 is 5095221.

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

It is not a de Polignac number, because 1225905 - 2³ = 1225897 is a prime.

It is a Curzon number.

1225905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1225907) 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, 40849 + ... + 40878.

It is an arithmetic number, because the mean of its divisors is an integer number (245184).

2^1225905 is an apocalyptic number.

1225905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225905 is a deficient number, since it is larger than the sum of its proper divisors (735567).

1225905 is an equidigital number, since it uses as much as digits as its factorization.

1225905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81735.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1225905 is about 1107.2059429031. The cubic root of 1225905 is about 107.0250909220.

The spelling of 1225905 in words is "one million, two hundred twenty-five thousand, nine hundred five".