24981989 has 4 divisors (see below), whose sum is σ = 25333920. Its totient is φ = 24630060.

The previous prime is 24981973. The next prime is 24981991. The reversal of 24981989 is 98918942.

It is a happy number.

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 24981989 - 2⁴ = 24981973 is a prime.

It is a super-2 number, since 2×24981989² = 1248199548792242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24981949) 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, 175859 + ... + 176000.

It is an arithmetic number, because the mean of its divisors is an integer number (6333480).

Almost surely, 2^24981989 is an apocalyptic number.

It is an amenable number.

24981989 is a deficient number, since it is larger than the sum of its proper divisors (351931).

24981989 is an equidigital number, since it uses as much as digits as its factorization.

24981989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351930.

The product of its digits is 373248, while the sum is 50.

The square root of 24981989 is about 4998.1985754870. The cubic root of 24981989 is about 292.3315376403.

The spelling of 24981989 in words is "twenty-four million, nine hundred eighty-one thousand, nine hundred eighty-nine".