1642668 has 12 divisors (see below), whose sum is σ = 3832920. Its totient is φ = 547552.

The previous prime is 1642661. The next prime is 1642679. The reversal of 1642668 is 8662461.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1642661) 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, 68433 + ... + 68456.

It is an arithmetic number, because the mean of its divisors is an integer number (319410).

2^1642668 is an apocalyptic number.

It is an amenable number.

1642668 is an abundant number, since it is smaller than the sum of its proper divisors (2190252).

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

1642668 is a wasteful number, since it uses less digits than its factorization.

1642668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136896 (or 136894 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 1642668 is about 1281.6661031642. Note that the first 3 decimals coincide. The cubic root of 1642668 is about 117.9912853853.

The spelling of 1642668 in words is "one million, six hundred forty-two thousand, six hundred sixty-eight".