25043989 has 4 divisors (see below), whose sum is σ = 25654860. Its totient is φ = 24433120.

The previous prime is 25043983. The next prime is 25044029. The reversal of 25043989 is 98934052.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8803089 + 16240900 = 2967^2 + 4030^2 .

It is a cyclic number.

It is not a de Polignac number, because 25043989 - 2²¹ = 22946837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25043983) 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, 305374 + ... + 305455.

It is an arithmetic number, because the mean of its divisors is an integer number (6413715).

Almost surely, 2^25043989 is an apocalyptic number.

It is an amenable number.

25043989 is a deficient number, since it is larger than the sum of its proper divisors (610871).

25043989 is an equidigital number, since it uses as much as digits as its factorization.

25043989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610870.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 25043989 is about 5004.3969666684. The cubic root of 25043989 is about 292.5731728200.

The spelling of 25043989 in words is "twenty-five million, forty-three thousand, nine hundred eighty-nine".