25457993 has 8 divisors (see below), whose sum is σ = 29406240. Its totient is φ = 21782080.

The previous prime is 25457983. The next prime is 25458001. The reversal of 25457993 is 39975452.

25457993 = 272² + 273² + ... + 458².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25457993 - 2⁴ = 25457977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25457933) 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 7 ways as a sum of consecutive naturals, for example, 67883 + ... + 68256.

It is an arithmetic number, because the mean of its divisors is an integer number (3675780).

Almost surely, 2^25457993 is an apocalyptic number.

It is an amenable number.

25457993 is a deficient number, since it is larger than the sum of its proper divisors (3948247).

25457993 is a wasteful number, since it uses less digits than its factorization.

25457993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136167.

The product of its digits is 340200, while the sum is 44.

The square root of 25457993 is about 5045.5914420413. The cubic root of 25457993 is about 294.1765526009.

The spelling of 25457993 in words is "twenty-five million, four hundred fifty-seven thousand, nine hundred ninety-three".