1668598 has 4 divisors (see below), whose sum is σ = 2502900. Its totient is φ = 834298.

The previous prime is 1668593. The next prime is 1668617. The reversal of 1668598 is 8958661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8958661 = 23 ⋅389507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417148 + ... + 417151.

It is an arithmetic number, because the mean of its divisors is an integer number (625725).

2^1668598 is an apocalyptic number.

1668598 is a deficient number, since it is larger than the sum of its proper divisors (834302).

1668598 is an equidigital number, since it uses as much as digits as its factorization.

1668598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834301.

The product of its digits is 103680, while the sum is 43.

The square root of 1668598 is about 1291.7422343486. The cubic root of 1668598 is about 118.6088894485.

The spelling of 1668598 in words is "one million, six hundred sixty-eight thousand, five hundred ninety-eight".