2161630 has 32 divisors (see below), whose sum is σ = 4239360. Its totient is φ = 790560.

The previous prime is 2161613. The next prime is 2161633. The reversal of 2161630 is 361612.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 = 2161598 and 2161607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161633) 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, 5707 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (132480).

2^2161630 is an apocalyptic number.

2161630 is a deficient number, since it is larger than the sum of its proper divisors (2077730).

2161630 is a wasteful number, since it uses less digits than its factorization.

2161630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2161630 is about 1470.2482783530. The cubic root of 2161630 is about 129.2985892312.

The spelling of 2161630 in words is "two million, one hundred sixty-one thousand, six hundred thirty".