1850138123 has 4 divisors (see below), whose sum is σ = 1856817600. Its totient is φ = 1843458648.

The previous prime is 1850138119. The next prime is 1850138189. The reversal of 1850138123 is 3218310581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3218310581 = 23 ⋅139926547.

It is a cyclic number.

It is not a de Polignac number, because 1850138123 - 2² = 1850138119 is a prime.

It is a super-2 number, since 2×1850138123² = 6846022148355926258, which contains 22 as substring.

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 1850138123.

It is not an unprimeable number, because it can be changed into a prime (1850138023) 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, 3339323 + ... + 3339876.

It is an arithmetic number, because the mean of its divisors is an integer number (464204400).

Almost surely, 2^1850138123 is an apocalyptic number.

1850138123 is a deficient number, since it is larger than the sum of its proper divisors (6679477).

1850138123 is an equidigital number, since it uses as much as digits as its factorization.

1850138123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6679476.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1850138123 is about 43013.2319525050. The cubic root of 1850138123 is about 1227.6315767718.

The spelling of 1850138123 in words is "one billion, eight hundred fifty million, one hundred thirty-eight thousand, one hundred twenty-three".