25489819 has 4 divisors (see below), whose sum is σ = 26598096. Its totient is φ = 24381544.

The previous prime is 25489813. The next prime is 25489879. The reversal of 25489819 is 91898452.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25489819 is a prime.

It is a super-2 number, since 2×25489819² = 1299461745305522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25489813) 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, 554104 + ... + 554149.

It is an arithmetic number, because the mean of its divisors is an integer number (6649524).

Almost surely, 2^25489819 is an apocalyptic number.

25489819 is a deficient number, since it is larger than the sum of its proper divisors (1108277).

25489819 is a wasteful number, since it uses less digits than its factorization.

25489819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108276.

The product of its digits is 207360, while the sum is 46.

The square root of 25489819 is about 5048.7442993283. The cubic root of 25489819 is about 294.2990886313.

It can be divided in two parts, 25489 and 819, that multiplied together give a triangular number (20875491 = T₆₄₆₁).

The spelling of 25489819 in words is "twenty-five million, four hundred eighty-nine thousand, eight hundred nineteen".