1838400398 has 8 divisors (see below), whose sum is σ = 2757858840. Its totient is φ = 919114120.

The previous prime is 1838400379. The next prime is 1838400433. The reversal of 1838400398 is 8930048381.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 11813 + ... + 61776.

It is an arithmetic number, because the mean of its divisors is an integer number (344732355).

Almost surely, 2^1838400398 is an apocalyptic number.

1838400398 is a deficient number, since it is larger than the sum of its proper divisors (919458442).

1838400398 is a wasteful number, since it uses less digits than its factorization.

1838400398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86082.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1838400398 is about 42876.5716679867. The cubic root of 1838400398 is about 1225.0299363502.

The spelling of 1838400398 in words is "one billion, eight hundred thirty-eight million, four hundred thousand, three hundred ninety-eight".