2193940 has 24 divisors (see below), whose sum is σ = 5265792. Its totient is φ = 752160.

The previous prime is 2193929. The next prime is 2193941. The reversal of 2193940 is 493912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 2193899 and 2193908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193941) 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, 7696 + ... + 7975.

It is an arithmetic number, because the mean of its divisors is an integer number (219408).

2^2193940 is an apocalyptic number.

2193940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2193940 is an abundant number, since it is smaller than the sum of its proper divisors (3071852).

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

2193940 is a wasteful number, since it uses less digits than its factorization.

2193940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15687 (or 15685 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2193940 is about 1481.1954631310. The cubic root of 2193940 is about 129.9396169277.

Subtracting from 2193940 its sum of digits (28), we obtain a palindrome (2193912).

It can be divided in two parts, 21 and 93940, that added together give a triangular number (93961 = T₄₃₃).

The spelling of 2193940 in words is "two million, one hundred ninety-three thousand, nine hundred forty".