25420215 has 8 divisors (see below), whose sum is σ = 40672368. Its totient is φ = 13557440.

The previous prime is 25420189. The next prime is 25420229. The reversal of 25420215 is 51202452.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25420215 - 2¹¹ = 25418167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25420191 and 25420200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 847326 + ... + 847355.

It is an arithmetic number, because the mean of its divisors is an integer number (5084046).

Almost surely, 2^25420215 is an apocalyptic number.

25420215 is a deficient number, since it is larger than the sum of its proper divisors (15252153).

25420215 is a wasteful number, since it uses less digits than its factorization.

25420215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694689.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25420215 is about 5041.8463879813. The cubic root of 25420215 is about 294.0309676298.

Adding to 25420215 its reverse (51202452), we get a palindrome (76622667).

The spelling of 25420215 in words is "twenty-five million, four hundred twenty thousand, two hundred fifteen".