2157663 has 8 divisors (see below), whose sum is σ = 2905776. Its totient is φ = 1424000.

The previous prime is 2157641. The next prime is 2157667. The reversal of 2157663 is 3667512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157663 - 2⁹ = 2157151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2157663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3258 + ... + 3863.

It is an arithmetic number, because the mean of its divisors is an integer number (363222).

2^2157663 is an apocalyptic number.

2157663 is a deficient number, since it is larger than the sum of its proper divisors (748113).

2157663 is a wasteful number, since it uses less digits than its factorization.

2157663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7225.

The product of its digits is 7560, while the sum is 30.

The square root of 2157663 is about 1468.8985669542. The cubic root of 2157663 is about 129.2194450057.

The spelling of 2157663 in words is "two million, one hundred fifty-seven thousand, six hundred sixty-three".