2520398989 has 4 divisors (see below), whose sum is σ = 2521029820. Its totient is φ = 2519768160.

The previous prime is 2520398987. The next prime is 2520399059. The reversal of 2520398989 is 9898930252.

2520398989 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.

It can be written as a sum of positive squares in 2 ways, for example, as 91584900 + 2428814089 = 9570^2 + 49283^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520398989 - 2¹ = 2520398987 is a prime.

It is a super-2 number, since 2×2520398989² = 12704822127504444242, 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 (2520398987) 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, 309384 + ... + 317425.

It is an arithmetic number, because the mean of its divisors is an integer number (630257455).

Almost surely, 2^2520398989 is an apocalyptic number.

It is an amenable number.

2520398989 is a deficient number, since it is larger than the sum of its proper divisors (630831).

2520398989 is an equidigital number, since it uses as much as digits as its factorization.

2520398989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630830.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 2520398989 is about 50203.5754603196. The cubic root of 2520398989 is about 1360.8902383930.

The spelling of 2520398989 in words is "two billion, five hundred twenty million, three hundred ninety-eight thousand, nine hundred eighty-nine".