1642663 has 4 divisors (see below), whose sum is σ = 1792008. Its totient is φ = 1493320.

The previous prime is 1642661. The next prime is 1642679. The reversal of 1642663 is 3662461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3662461 = 11 ⋅332951.

It is a cyclic number.

It is not a de Polignac number, because 1642663 - 2¹ = 1642661 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74656 + ... + 74677.

It is an arithmetic number, because the mean of its divisors is an integer number (448002).

2^1642663 is an apocalyptic number.

1642663 is a deficient number, since it is larger than the sum of its proper divisors (149345).

1642663 is a wasteful number, since it uses less digits than its factorization.

1642663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149344.

The product of its digits is 5184, while the sum is 28.

The square root of 1642663 is about 1281.6641525766. The cubic root of 1642663 is about 117.9911656701.

The spelling of 1642663 in words is "one million, six hundred forty-two thousand, six hundred sixty-three".