2138998835 has 4 divisors (see below), whose sum is σ = 2566798608. Its totient is φ = 1711199064.

The previous prime is 2138998831. The next prime is 2138998847. The reversal of 2138998835 is 5388998312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2138998835 - 2² = 2138998831 is a prime.

It is a super-2 number, since 2×2138998835² = 9150632032262714450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138998831) 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 3 ways as a sum of consecutive naturals, for example, 213899879 + ... + 213899888.

It is an arithmetic number, because the mean of its divisors is an integer number (641699652).

Almost surely, 2^2138998835 is an apocalyptic number.

2138998835 is a deficient number, since it is larger than the sum of its proper divisors (427799773).

2138998835 is an equidigital number, since it uses as much as digits as its factorization.

2138998835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427799772.

The product of its digits is 3732480, while the sum is 56.

The square root of 2138998835 is about 46249.3117246084. The cubic root of 2138998835 is about 1288.4577516892.

The spelling of 2138998835 in words is "two billion, one hundred thirty-eight million, nine hundred ninety-eight thousand, eight hundred thirty-five".