1209625 has 8 divisors (see below), whose sum is σ = 1509768. Its totient is φ = 967600.

The previous prime is 1209617. The next prime is 1209629. The reversal of 1209625 is 5269021.

It can be written as a sum of positive squares in 4 ways, for example, as 17161 + 1192464 = 131^2 + 1092^2 .

It is not a de Polignac number, because 1209625 - 2³ = 1209617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209625.

It is not an unprimeable number, because it can be changed into a prime (1209629) 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, 4714 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (188721).

2^1209625 is an apocalyptic number.

It is an amenable number.

1209625 is a deficient number, since it is larger than the sum of its proper divisors (300143).

1209625 is an frugal number, since it uses more digits than its factorization.

1209625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9692 (or 9682 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1209625 is about 1099.8295322458. The cubic root of 1209625 is about 106.5492142517.

It can be divided in two parts, 12096 and 25, that added together give a palindrome (12121).

The spelling of 1209625 in words is "one million, two hundred nine thousand, six hundred twenty-five".