25420547 has 4 divisors (see below), whose sum is σ = 25501056. Its totient is φ = 25340040.

The previous prime is 25420531. The next prime is 25420579. The reversal of 25420547 is 74502452.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25420547 - 2⁴ = 25420531 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (25420847) 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 3 ways as a sum of consecutive naturals, for example, 39779 + ... + 40412.

It is an arithmetic number, because the mean of its divisors is an integer number (6375264).

Almost surely, 2^25420547 is an apocalyptic number.

25420547 is a deficient number, since it is larger than the sum of its proper divisors (80509).

25420547 is an equidigital number, since it uses as much as digits as its factorization.

25420547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80508.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 25420547 is about 5041.8793123200. The cubic root of 25420547 is about 294.0322476852.

Adding to 25420547 its reverse (74502452), we get a palindrome (99922999).

The spelling of 25420547 in words is "twenty-five million, four hundred twenty thousand, five hundred forty-seven".