1668465 has 32 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 836352.

The previous prime is 1668449. The next prime is 1668467. The reversal of 1668465 is 5648661.

It is not a de Polignac number, because 1668465 - 2⁴ = 1668449 is a prime.

It is a super-3 number, since 3×1668465³ = 13933895749711333875, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1932 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2^1668465 is an apocalyptic number.

1668465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1668465 is a deficient number, since it is larger than the sum of its proper divisors (1476495).

1668465 is a wasteful number, since it uses less digits than its factorization.

1668465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 752 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1668465 is about 1291.6907524636. The cubic root of 1668465 is about 118.6057380201.

Adding to 1668465 its product of digits (34560), we get a square (1703025 = 1305²).

The spelling of 1668465 in words is "one million, six hundred sixty-eight thousand, four hundred sixty-five".