1209641 has 4 divisors (see below), whose sum is σ = 1242372. Its totient is φ = 1176912.

The previous prime is 1209631. The next prime is 1209647. The reversal of 1209641 is 1469021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1469021 = 17 ⋅86413.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 714025 = 704^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209641 - 2⁶ = 1209577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16310 + ... + 16383.

It is an arithmetic number, because the mean of its divisors is an integer number (310593).

2^1209641 is an apocalyptic number.

It is an amenable number.

1209641 is a deficient number, since it is larger than the sum of its proper divisors (32731).

1209641 is an equidigital number, since it uses as much as digits as its factorization.

1209641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32730.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1209641 is about 1099.8368060762. The cubic root of 1209641 is about 106.5496840336.

The spelling of 1209641 in words is "one million, two hundred nine thousand, six hundred forty-one".