1838648405 has 16 divisors (see below), whose sum is σ = 2511609984. Its totient is φ = 1279058880.

The previous prime is 1838648393. The next prime is 1838648417. The reversal of 1838648405 is 5048468381.

It is an interprime number because it is at equal distance from previous prime (1838648393) and next prime (1838648417).

It is not a de Polignac number, because 1838648405 - 2⁴ = 1838648389 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 1838648405.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 725474 + ... + 728003.

It is an arithmetic number, because the mean of its divisors is an integer number (156975624).

Almost surely, 2^1838648405 is an apocalyptic number.

It is an amenable number.

1838648405 is a deficient number, since it is larger than the sum of its proper divisors (672961579).

1838648405 is a wasteful number, since it uses less digits than its factorization.

1838648405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453516.

The product of its (nonzero) digits is 737280, while the sum is 47.

The square root of 1838648405 is about 42879.4636743512. The cubic root of 1838648405 is about 1225.0850208934.

The spelling of 1838648405 in words is "one billion, eight hundred thirty-eight million, six hundred forty-eight thousand, four hundred five".