1240644 has 12 divisors (see below), whose sum is σ = 2894864. Its totient is φ = 413544.

The previous prime is 1240637. The next prime is 1240667. The reversal of 1240644 is 4460421.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1240644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51682 + ... + 51705.

2^1240644 is an apocalyptic number.

It is an amenable number.

1240644 is an abundant number, since it is smaller than the sum of its proper divisors (1654220).

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

1240644 is a wasteful number, since it uses less digits than its factorization.

1240644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103394 (or 103392 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1240644 is about 1113.8419995673. The cubic root of 1240644 is about 107.4523026186.

The spelling of 1240644 in words is "one million, two hundred forty thousand, six hundred forty-four".