25499420 has 24 divisors (see below), whose sum is σ = 53736144. Its totient is φ = 10164096.

The previous prime is 25499407. The next prime is 25499429. The reversal of 25499420 is 2499452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25499429) 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 7 ways as a sum of consecutive naturals, for example, 4064 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (2239006).

Almost surely, 2^25499420 is an apocalyptic number.

25499420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25499420 is an abundant number, since it is smaller than the sum of its proper divisors (28236724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25499420 is a wasteful number, since it uses less digits than its factorization.

25499420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469 (or 4467 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 25499420 is about 5049.6950402970. The cubic root of 25499420 is about 294.3360342430.

The spelling of 25499420 in words is "twenty-five million, four hundred ninety-nine thousand, four hundred twenty".