25440137 has 4 divisors (see below), whose sum is σ = 25534980. Its totient is φ = 25345296.

The previous prime is 25440091. The next prime is 25440167. The reversal of 25440137 is 73104452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14523721 + 10916416 = 3811^2 + 3304^2 .

It is a cyclic number.

It is not a de Polignac number, because 25440137 - 2⁸ = 25439881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440167) 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, 47018 + ... + 47555.

It is an arithmetic number, because the mean of its divisors is an integer number (6383745).

Almost surely, 2^25440137 is an apocalyptic number.

It is an amenable number.

25440137 is a deficient number, since it is larger than the sum of its proper divisors (94843).

25440137 is an equidigital number, since it uses as much as digits as its factorization.

25440137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94842.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 25440137 is about 5043.8216661575. The cubic root of 25440137 is about 294.1077589468.

Adding to 25440137 its reverse (73104452), we get a palindrome (98544589).

The spelling of 25440137 in words is "twenty-five million, four hundred forty thousand, one hundred thirty-seven".