2163918 has 8 divisors (see below), whose sum is σ = 4327848. Its totient is φ = 721304.

The previous prime is 2163911. The next prime is 2163919. The reversal of 2163918 is 8193612.

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

2163918 is an admirable number.

It is a super-2 number, since 2×2163918² = 9365082221448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163911) 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, 180321 + ... + 180332.

It is an arithmetic number, because the mean of its divisors is an integer number (540981).

2^2163918 is an apocalyptic number.

2163918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2163918 is a wasteful number, since it uses less digits than its factorization.

2163918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360658.

The product of its digits is 2592, while the sum is 30.

The square root of 2163918 is about 1471.0261724388. The cubic root of 2163918 is about 129.3441922957.

It can be divided in two parts, 2163 and 918, that added together give a triangular number (3081 = T₇₈).

The spelling of 2163918 in words is "two million, one hundred sixty-three thousand, nine hundred eighteen".