2038691909 has 4 divisors (see below), whose sum is σ = 2108991660. Its totient is φ = 1968392160.

The previous prime is 2038691903. The next prime is 2038691911. The reversal of 2038691909 is 9091968302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9091968302 = 2 ⋅4545984151.

It can be written as a sum of positive squares in 2 ways, for example, as 1394649025 + 644042884 = 37345^2 + 25378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2038691909 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 (2038691903) 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, 35149832 + ... + 35149889.

It is an arithmetic number, because the mean of its divisors is an integer number (527247915).

Almost surely, 2^2038691909 is an apocalyptic number.

2038691909 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2038691909 is a deficient number, since it is larger than the sum of its proper divisors (70299751).

2038691909 is an equidigital number, since it uses as much as digits as its factorization.

2038691909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70299750.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 2038691909 is about 45151.8760296845. The cubic root of 2038691909 is about 1267.9940036686.

The spelling of 2038691909 in words is "two billion, thirty-eight million, six hundred ninety-one thousand, nine hundred nine".