2161395 has 24 divisors (see below), whose sum is σ = 3836976. Its totient is φ = 1124928.

The previous prime is 2161373. The next prime is 2161409. The reversal of 2161395 is 5931612.

It is not a de Polignac number, because 2161395 - 2⁶ = 2161331 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1377 + ... + 2493.

It is an arithmetic number, because the mean of its divisors is an integer number (159874).

2^2161395 is an apocalyptic number.

2161395 is a deficient number, since it is larger than the sum of its proper divisors (1675581).

2161395 is a wasteful number, since it uses less digits than its factorization.

2161395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1168 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2161395 is about 1470.1683577060. The cubic root of 2161395 is about 129.2939035280.

It can be divided in two parts, 2161 and 395, that added together give a triangular number (2556 = T₇₁).

The spelling of 2161395 in words is "two million, one hundred sixty-one thousand, three hundred ninety-five".