2167998 has 32 divisors (see below), whose sum is σ = 5080320. Its totient is φ = 603840.

The previous prime is 2167987. The next prime is 2167999. The reversal of 2167998 is 8997612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2167999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1093 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (158760).

2^2167998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2167998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540160).

2167998 is an abundant number, since it is smaller than the sum of its proper divisors (2912322).

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

2167998 is a wasteful number, since it uses less digits than its factorization.

2167998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312.

The product of its digits is 54432, while the sum is 42.

The square root of 2167998 is about 1472.4123063870. The cubic root of 2167998 is about 129.4254327405.

The spelling of 2167998 in words is "two million, one hundred sixty-seven thousand, nine hundred ninety-eight".