1209642 has 32 divisors (see below), whose sum is σ = 2806272. Its totient is φ = 340464.

The previous prime is 1209631. The next prime is 1209647. The reversal of 1209642 is 2469021.

It is an Ulam number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 3313 + ... + 3659.

It is an arithmetic number, because the mean of its divisors is an integer number (87696).

2^1209642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1403136).

1209642 is an abundant number, since it is smaller than the sum of its proper divisors (1596630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209642 is a wasteful number, since it uses less digits than its factorization.

1209642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1209642 is about 1099.8372606891. The cubic root of 1209642 is about 106.5497133948.

The spelling of 1209642 in words is "one million, two hundred nine thousand, six hundred forty-two".