25903993 has 4 divisors (see below), whose sum is σ = 26039808. Its totient is φ = 25768180.

The previous prime is 25903991. The next prime is 25904027. The reversal of 25903993 is 39930952.

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 25903993 - 2¹ = 25903991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25903991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67621 + ... + 68002.

It is an arithmetic number, because the mean of its divisors is an integer number (6509952).

Almost surely, 2^25903993 is an apocalyptic number.

It is an amenable number.

25903993 is a deficient number, since it is larger than the sum of its proper divisors (135815).

25903993 is a wasteful number, since it uses less digits than its factorization.

25903993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135814.

The product of its (nonzero) digits is 65610, while the sum is 40.

The square root of 25903993 is about 5089.5965458963. The cubic root of 25903993 is about 295.8845156083.

It can be divided in two parts, 25903 and 993, that added together give a square (26896 = 164²).

The spelling of 25903993 in words is "twenty-five million, nine hundred three thousand, nine hundred ninety-three".