25420145 has 12 divisors (see below), whose sum is σ = 30844380. Its totient is φ = 20111424.

The previous prime is 25420139. The next prime is 25420159. The reversal of 25420145 is 54102452.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1517824 + 23902321 = 1232^2 + 4889^2 .

It is not a de Polignac number, because 25420145 - 2¹⁴ = 25403761 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25420145.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110891 + ... + 111119.

It is an arithmetic number, because the mean of its divisors is an integer number (2570365).

Almost surely, 2^25420145 is an apocalyptic number.

It is an amenable number.

25420145 is a deficient number, since it is larger than the sum of its proper divisors (5424235).

25420145 is an equidigital number, since it uses as much as digits as its factorization.

25420145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 383 counting only the distinct ones).

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

The square root of 25420145 is about 5041.8394460752. The cubic root of 25420145 is about 294.0306977371.

Adding to 25420145 its reverse (54102452), we get a palindrome (79522597).

The spelling of 25420145 in words is "twenty-five million, four hundred twenty thousand, one hundred forty-five".