2143245 has 32 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 1016064.

The previous prime is 2143243. The next prime is 2143259. The reversal of 2143245 is 5423412.

2143245 = 163² + 164² + ... + 220².

It is not a de Polignac number, because 2143245 - 2¹ = 2143243 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5466 + ... + 5844.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^2143245 is an apocalyptic number.

It is an amenable number.

2143245 is a deficient number, since it is larger than the sum of its proper divisors (1687155).

2143245 is a wasteful number, since it uses less digits than its factorization.

2143245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its digits is 960, while the sum is 21.

The square root of 2143245 is about 1463.9825818636. The cubic root of 2143245 is about 128.9309768360.

Adding to 2143245 its reverse (5423412), we get a palindrome (7566657).

The spelling of 2143245 in words is "two million, one hundred forty-three thousand, two hundred forty-five".