2161923 has 8 divisors (see below), whose sum is σ = 2937168. Its totient is φ = 1413984.

The previous prime is 2161919. The next prime is 2161927. The reversal of 2161923 is 3291612.

It is an interprime number because it is at equal distance from previous prime (2161919) and next prime (2161927).

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

It is not a de Polignac number, because 2161923 - 2² = 2161919 is a prime.

It is a super-2 number, since 2×2161923² = 9347822115858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2161893 and 2161902.

It is not an unprimeable number, because it can be changed into a prime (2161927) 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, 6640 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (367146).

2^2161923 is an apocalyptic number.

2161923 is a deficient number, since it is larger than the sum of its proper divisors (775245).

2161923 is a wasteful number, since it uses less digits than its factorization.

2161923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13653.

The product of its digits is 648, while the sum is 24.

The square root of 2161923 is about 1470.3479180112. The cubic root of 2161923 is about 129.3044309302.

The spelling of 2161923 in words is "two million, one hundred sixty-one thousand, nine hundred twenty-three".