2161478 has 16 divisors (see below), whose sum is σ = 3723840. Its totient is φ = 930600.

The previous prime is 2161469. The next prime is 2161493. The reversal of 2161478 is 8741612.

2161478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2161478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2168 + ... + 3003.

It is an arithmetic number, because the mean of its divisors is an integer number (232740).

2^2161478 is an apocalyptic number.

2161478 is a deficient number, since it is larger than the sum of its proper divisors (1562362).

2161478 is a wasteful number, since it uses less digits than its factorization.

2161478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203.

The product of its digits is 2688, while the sum is 29.

The square root of 2161478 is about 1470.1965854946. The cubic root of 2161478 is about 129.2955585173.

The spelling of 2161478 in words is "two million, one hundred sixty-one thousand, four hundred seventy-eight".