2142145 has 4 divisors (see below), whose sum is σ = 2570580. Its totient is φ = 1713712.

The previous prime is 2142121. The next prime is 2142149. The reversal of 2142145 is 5412412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1495729 + 646416 = 1223^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142145 - 2¹⁷ = 2011073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2142149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214210 + ... + 214219.

It is an arithmetic number, because the mean of its divisors is an integer number (642645).

2^2142145 is an apocalyptic number.

It is an amenable number.

2142145 is a deficient number, since it is larger than the sum of its proper divisors (428435).

2142145 is an equidigital number, since it uses as much as digits as its factorization.

2142145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428434.

The product of its digits is 320, while the sum is 19.

The square root of 2142145 is about 1463.6068461168. The cubic root of 2142145 is about 128.9089155310.

Adding to 2142145 its reverse (5412412), we get a palindrome (7554557).

The spelling of 2142145 in words is "two million, one hundred forty-two thousand, one hundred forty-five".