1668542 has 12 divisors (see below), whose sum is σ = 2642616. Its totient is φ = 790020.

The previous prime is 1668539. The next prime is 1668551. The reversal of 1668542 is 2458661.

It is a junction number, because it is equal to n+sod(n) for n = 1668499 and 1668508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434 + ... + 1877.

It is an arithmetic number, because the mean of its divisors is an integer number (220218).

2^1668542 is an apocalyptic number.

1668542 is a deficient number, since it is larger than the sum of its proper divisors (974074).

1668542 is a wasteful number, since it uses less digits than its factorization.

1668542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351 (or 2332 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 1668542 is about 1291.7205580155. The cubic root of 1668542 is about 118.6075625517.

The spelling of 1668542 in words is "one million, six hundred sixty-eight thousand, five hundred forty-two".