1838069257 has 4 divisors (see below), whose sum is σ = 1946190996. Its totient is φ = 1729947520.

The previous prime is 1838069243. The next prime is 1838069269. The reversal of 1838069257 is 7529608381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7529608381 = 1669 ⋅4511449.

It can be written as a sum of positive squares in 2 ways, for example, as 1450924281 + 387144976 = 38091^2 + 19676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1838069257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1838069257.

It is not an unprimeable number, because it can be changed into a prime (1838069227) 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, 54060844 + ... + 54060877.

It is an arithmetic number, because the mean of its divisors is an integer number (486547749).

Almost surely, 2^1838069257 is an apocalyptic number.

1838069257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1838069257 is a deficient number, since it is larger than the sum of its proper divisors (108121739).

1838069257 is a wasteful number, since it uses less digits than its factorization.

1838069257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108121738.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1838069257 is about 42872.7099330098. The cubic root of 1838069257 is about 1224.9563792881.

The spelling of 1838069257 in words is "one billion, eight hundred thirty-eight million, sixty-nine thousand, two hundred fifty-seven".