2194640 has 40 divisors (see below), whose sum is σ = 5832960. Its totient is φ = 752256.

The previous prime is 2194639. The next prime is 2194663. The reversal of 2194640 is 464912.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (145824).

2^2194640 is an apocalyptic number.

2194640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2194640 is an abundant number, since it is smaller than the sum of its proper divisors (3638320).

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

2194640 is a wasteful number, since it uses less digits than its factorization.

2194640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2194640 is about 1481.4317399057. The cubic root of 2194640 is about 129.9534349993.

Subtracting from 2194640 its product of nonzero digits (1728), we obtain a palindrome (2192912).

The spelling of 2194640 in words is "two million, one hundred ninety-four thousand, six hundred forty".