2199981 has 8 divisors (see below), whose sum is σ = 3352384. Its totient is φ = 1257120.

The previous prime is 2199979. The next prime is 2200013. The reversal of 2199981 is 1899912.

It is a happy number.

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

It is not a de Polignac number, because 2199981 - 2¹ = 2199979 is a prime.

It is a super-2 number, since 2×2199981² = 9679832800722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199931) 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, 52360 + ... + 52401.

It is an arithmetic number, because the mean of its divisors is an integer number (419048).

2^2199981 is an apocalyptic number.

2199981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2199981 is a deficient number, since it is larger than the sum of its proper divisors (1152403).

2199981 is a wasteful number, since it uses less digits than its factorization.

2199981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104771.

The product of its digits is 11664, while the sum is 39.

The square root of 2199981 is about 1483.2332925066. The cubic root of 2199981 is about 130.0587702714.

It can be divided in two parts, 21 and 99981, that multiplied together give a square (2099601 = 1449²).

The spelling of 2199981 in words is "two million, one hundred ninety-nine thousand, nine hundred eighty-one".