2138902849 has 4 divisors (see below), whose sum is σ = 2142229936. Its totient is φ = 2135575764.

The previous prime is 2138902807. The next prime is 2138902853. The reversal of 2138902849 is 9482098312.

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 2138902849 - 2¹⁵ = 2138870081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2138902799 and 2138902808.

It is not an unprimeable number, because it can be changed into a prime (2138902349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662579 + ... + 1663864.

It is an arithmetic number, because the mean of its divisors is an integer number (535557484).

Almost surely, 2^2138902849 is an apocalyptic number.

It is an amenable number.

2138902849 is a deficient number, since it is larger than the sum of its proper divisors (3327087).

2138902849 is an equidigital number, since it uses as much as digits as its factorization.

2138902849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327086.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 2138902849 is about 46248.2740110374. The cubic root of 2138902849 is about 1288.4384785361.

The spelling of 2138902849 in words is "two billion, one hundred thirty-eight million, nine hundred two thousand, eight hundred forty-nine".