24721489 has 12 divisors (see below), whose sum is σ = 28182000. Its totient is φ = 21615984.

The previous prime is 24721469. The next prime is 24721493. The reversal of 24721489 is 98412742.

It is not a de Polignac number, because 24721489 - 2⁹ = 24720977 is a prime.

It is a super-2 number, since 2×24721489² = 1222304036754242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24721429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639 + ... + 7060.

It is an arithmetic number, because the mean of its divisors is an integer number (2348500).

Almost surely, 2^24721489 is an apocalyptic number.

It is an amenable number.

24721489 is a deficient number, since it is larger than the sum of its proper divisors (3460511).

24721489 is a wasteful number, since it uses less digits than its factorization.

24721489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7744 (or 7731 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 24721489 is about 4972.0708965179. The cubic root of 24721489 is about 291.3118883385.

It can be divided in two parts, 247 and 21489, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 24721489 in words is "twenty-four million, seven hundred twenty-one thousand, four hundred eighty-nine".