2145897 has 12 divisors (see below), whose sum is σ = 3338244. Its totient is φ = 1320480.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145897 is 7985412.

2145897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 1879641 = 516^2 + 1371^2 .

It is not a de Polignac number, because 2145897 - 2⁷ = 2145769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145827) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9054 + ... + 9287.

It is an arithmetic number, because the mean of its divisors is an integer number (278187).

2^2145897 is an apocalyptic number.

It is an amenable number.

2145897 is a deficient number, since it is larger than the sum of its proper divisors (1192347).

2145897 is a wasteful number, since it uses less digits than its factorization.

2145897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360 (or 18357 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2145897 is about 1464.8880503301. Note that the first 3 decimals coincide. The cubic root of 2145897 is about 128.9841336174.

The spelling of 2145897 in words is "two million, one hundred forty-five thousand, eight hundred ninety-seven".