25440001 has 4 divisors (see below), whose sum is σ = 26546112. Its totient is φ = 24333892.

The previous prime is 25439969. The next prime is 25440011. The reversal of 25440001 is 10004452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25440001 - 2⁵ = 25439969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440011) 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, 553021 + ... + 553066.

It is an arithmetic number, because the mean of its divisors is an integer number (6636528).

Almost surely, 2^25440001 is an apocalyptic number.

It is an amenable number.

25440001 is a deficient number, since it is larger than the sum of its proper divisors (1106111).

25440001 is a wasteful number, since it uses less digits than its factorization.

25440001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106110.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25440001 is about 5043.8081842988. The cubic root of 25440001 is about 294.1072348573.

Adding to 25440001 its reverse (10004452), we get a palindrome (35444453).

The spelling of 25440001 in words is "twenty-five million, four hundred forty thousand, one".