2499999989 has 4 divisors (see below), whose sum is σ = 2510460480. Its totient is φ = 2489539500.

The previous prime is 2499999977. The next prime is 2500000001. The reversal of 2499999989 is 9899999942.

2499999989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (2499999977) and next prime (2500000001).

It is a cyclic number.

It is not a de Polignac number, because 2499999989 - 2¹⁶ = 2499934453 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 (2499999959) 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, 5229887 + ... + 5230364.

It is an arithmetic number, because the mean of its divisors is an integer number (627615120).

Almost surely, 2^2499999989 is an apocalyptic number.

It is an amenable number.

2499999989 is a deficient number, since it is larger than the sum of its proper divisors (10460491).

2499999989 is a wasteful number, since it uses less digits than its factorization.

2499999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10460490.

The product of its digits is 306110016, while the sum is 77.

The square root of 2499999989 is about 49999.9998900000. Note that the first 3 decimals coincide. The cubic root of 2499999989 is about 1357.2088063069.

The spelling of 2499999989 in words is "two billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".