1642644 has 36 divisors (see below), whose sum is σ = 4202016. Its totient is φ = 541008.

The previous prime is 1642633. The next prime is 1642649. The reversal of 1642644 is 4462461.

1642644 is a `hidden beast` number, since 16 + 4 + 2 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3487 + ... + 3929.

2^1642644 is an apocalyptic number.

It is an amenable number.

1642644 is an abundant number, since it is smaller than the sum of its proper divisors (2559372).

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

1642644 is a wasteful number, since it uses less digits than its factorization.

1642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 551 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 1642644 is about 1281.6567403170. The cubic root of 1642644 is about 117.9907107501.

The spelling of 1642644 in words is "one million, six hundred forty-two thousand, six hundred forty-four".