2538978993 has 16 divisors (see below), whose sum is σ = 3924992640. Its totient is φ = 1619058672.

The previous prime is 2538978991. The next prime is 2538979043. The reversal of 2538978993 is 3998798352.

2538978993 is a `hidden beast` number, since 2 + 538 + 9 + 7 + 8 + 9 + 93 = 666.

It is not a de Polignac number, because 2538978993 - 2¹ = 2538978991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2538978993.

It is not an unprimeable number, because it can be changed into a prime (2538978991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2043646 + ... + 2044887.

It is an arithmetic number, because the mean of its divisors is an integer number (245312040).

Almost surely, 2^2538978993 is an apocalyptic number.

2538978993 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2538978993 is a deficient number, since it is larger than the sum of its proper divisors (1386013647).

2538978993 is a wasteful number, since it uses less digits than its factorization.

2538978993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088565 (or 4088559 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The square root of 2538978993 is about 50388.2822985662. The cubic root of 2538978993 is about 1364.2261475278.

The spelling of 2538978993 in words is "two billion, five hundred thirty-eight million, nine hundred seventy-eight thousand, nine hundred ninety-three".