2145425 has 6 divisors (see below), whose sum is σ = 2660358. Its totient is φ = 1716320.

The previous prime is 2145421. The next prime is 2145433. The reversal of 2145425 is 5245412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 117649 + 2027776 = 343^2 + 1424^2 .

It is not a de Polignac number, because 2145425 - 2² = 2145421 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145425.

It is not an unprimeable number, because it can be changed into a prime (2145421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42884 + ... + 42933.

It is an arithmetic number, because the mean of its divisors is an integer number (443393).

2^2145425 is an apocalyptic number.

2145425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145425 is a deficient number, since it is larger than the sum of its proper divisors (514933).

2145425 is an equidigital number, since it uses as much as digits as its factorization.

2145425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85827 (or 85822 counting only the distinct ones).

The product of its digits is 1600, while the sum is 23.

The square root of 2145425 is about 1464.7269370091. The cubic root of 2145425 is about 128.9746760377.

The spelling of 2145425 in words is "two million, one hundred forty-five thousand, four hundred twenty-five".