1668513 has 32 divisors (see below), whose sum is σ = 2875392. Its totient is φ = 835200.

The previous prime is 1668509. The next prime is 1668517. The reversal of 1668513 is 3158661.

It is an interprime number because it is at equal distance from previous prime (1668509) and next prime (1668517).

It is not a de Polignac number, because 1668513 - 2² = 1668509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7045 + ... + 7277.

It is an arithmetic number, because the mean of its divisors is an integer number (89856).

2^1668513 is an apocalyptic number.

It is an amenable number.

1668513 is a deficient number, since it is larger than the sum of its proper divisors (1206879).

1668513 is a wasteful number, since it uses less digits than its factorization.

1668513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its digits is 4320, while the sum is 30.

The square root of 1668513 is about 1291.7093326287. The cubic root of 1668513 is about 118.6068753971.

The spelling of 1668513 in words is "one million, six hundred sixty-eight thousand, five hundred thirteen".