25400001 has 16 divisors (see below), whose sum is σ = 37416960. Its totient is φ = 15197520.

The previous prime is 25399987. The next prime is 25400003. The reversal of 25400001 is 10000452.

It is not a de Polignac number, because 25400001 - 2⁹ = 25399489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25400001.

It is not an unprimeable number, because it can be changed into a prime (25400003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265 + ... + 7478.

It is an arithmetic number, because the mean of its divisors is an integer number (2338560).

Almost surely, 2^25400001 is an apocalyptic number.

It is an amenable number.

25400001 is a deficient number, since it is larger than the sum of its proper divisors (12016959).

25400001 is a wasteful number, since it uses less digits than its factorization.

25400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 25400001 is about 5039.8413665511. The cubic root of 25400001 is about 293.9530097512.

Adding to 25400001 its reverse (10000452), we get a palindrome (35400453).

The spelling of 25400001 in words is "twenty-five million, four hundred thousand, one".