25416399 has 4 divisors (see below), whose sum is σ = 33888536. Its totient is φ = 16944264.

The previous prime is 25416379. The next prime is 25416407. The reversal of 25416399 is 99361452.

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

It is a de Polignac number, because none of the positive numbers 2^k-25416399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25416359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4236064 + ... + 4236069.

It is an arithmetic number, because the mean of its divisors is an integer number (8472134).

Almost surely, 2^25416399 is an apocalyptic number.

25416399 is a deficient number, since it is larger than the sum of its proper divisors (8472137).

25416399 is an equidigital number, since it uses as much as digits as its factorization.

25416399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472136.

The product of its digits is 58320, while the sum is 39.

The square root of 25416399 is about 5041.4679409870. The cubic root of 25416399 is about 294.0162539026.

It can be divided in two parts, 254 and 16399, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 25416399 in words is "twenty-five million, four hundred sixteen thousand, three hundred ninety-nine".