25401599 has 6 divisors (see below), whose sum is σ = 25769520. Its totient is φ = 25038860.

The previous prime is 25401589. The next prime is 25401611. The reversal of 25401599 is 99510452.

It is a Cunningham number, because it is equal to 5040²-1.

It is not a de Polignac number, because 25401599 - 2⁴ = 25401583 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25401529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2522 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (4294920).

Almost surely, 2^25401599 is an apocalyptic number.

25401599 is a deficient number, since it is larger than the sum of its proper divisors (367921).

25401599 is an frugal number, since it uses more digits than its factorization.

25401599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 25401599 is about 5039.9999007936. Note that the first 4 decimals coincide. The cubic root of 25401599 is about 293.9591741481.

The spelling of 25401599 in words is "twenty-five million, four hundred one thousand, five hundred ninety-nine".