1662645 has 16 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 880704.

The previous prime is 1662643. The next prime is 1662653. The reversal of 1662645 is 5462661.

It is not a de Polignac number, because 1662645 - 2¹ = 1662643 is a prime.

It is a Curzon number.

1662645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2707 + ... + 3263.

It is an arithmetic number, because the mean of its divisors is an integer number (167400).

2^1662645 is an apocalyptic number.

1662645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1662645 is a deficient number, since it is larger than the sum of its proper divisors (1015755).

1662645 is a wasteful number, since it uses less digits than its factorization.

1662645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764.

The product of its digits is 8640, while the sum is 30.

The square root of 1662645 is about 1289.4359231850. The cubic root of 1662645 is about 118.4676690804.

The spelling of 1662645 in words is "one million, six hundred sixty-two thousand, six hundred forty-five".