1205625 has 20 divisors (see below), whose sum is σ = 2011856. Its totient is φ = 642000.

The previous prime is 1205609. The next prime is 1205627. The reversal of 1205625 is 5265021.

It is not a de Polignac number, because 1205625 - 2⁴ = 1205609 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1554 + ... + 2196.

2^1205625 is an apocalyptic number.

1205625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205625 is a deficient number, since it is larger than the sum of its proper divisors (806231).

1205625 is an frugal number, since it uses more digits than its factorization.

1205625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1205625 is about 1098.0095627999. The cubic root of 1205625 is about 106.4316385551.

Subtracting from 1205625 its sum of digits (21), we obtain a square (1205604 = 1098²).

It can be divided in two parts, 1205 and 625, that added together give a triangular number (1830 = T₆₀).

The spelling of 1205625 in words is "one million, two hundred five thousand, six hundred twenty-five".