24999989 has 4 divisors (see below), whose sum is σ = 28571424. Its totient is φ = 21428556.

The previous prime is 24999983. The next prime is 25000009. The reversal of 24999989 is 98999942.

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 24999989 - 2⁴ = 24999973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24999983) 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, 1785707 + ... + 1785720.

It is an arithmetic number, because the mean of its divisors is an integer number (7142856).

Almost surely, 2^24999989 is an apocalyptic number.

It is an amenable number.

24999989 is a deficient number, since it is larger than the sum of its proper divisors (3571435).

24999989 is an equidigital number, since it uses as much as digits as its factorization.

24999989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571434.

The product of its digits is 3779136, while the sum is 59.

The square root of 24999989 is about 4999.9988999999. The cubic root of 24999989 is about 292.4017309357.

The spelling of 24999989 in words is "twenty-four million, nine hundred ninety-nine thousand, nine hundred eighty-nine".