2181634 has 16 divisors (see below), whose sum is σ = 4027968. Its totient is φ = 862992.

The previous prime is 2181629. The next prime is 2181649. The reversal of 2181634 is 4361812.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2181599 and 2181608.

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, 5812 + ... + 6175.

It is an arithmetic number, because the mean of its divisors is an integer number (251748).

2^2181634 is an apocalyptic number.

2181634 is a deficient number, since it is larger than the sum of its proper divisors (1846334).

2181634 is a wasteful number, since it uses less digits than its factorization.

2181634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12009.

The product of its digits is 1152, while the sum is 25.

The square root of 2181634 is about 1477.0355445960. The cubic root of 2181634 is about 129.6962137369.

The spelling of 2181634 in words is "two million, one hundred eighty-one thousand, six hundred thirty-four".