1898134823 has 12 divisors (see below), whose sum is σ = 2144745360. Its totient is φ = 1675941696.

The previous prime is 1898134807. The next prime is 1898134841. The reversal of 1898134823 is 3284318981.

It is a happy number.

It is not a de Polignac number, because 1898134823 - 2⁴ = 1898134807 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898134223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240278 + ... + 248051.

It is an arithmetic number, because the mean of its divisors is an integer number (178728780).

Almost surely, 2^1898134823 is an apocalyptic number.

1898134823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1898134823 is a deficient number, since it is larger than the sum of its proper divisors (246610537).

1898134823 is a wasteful number, since it uses less digits than its factorization.

1898134823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488378 (or 488365 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 1898134823 is about 43567.5891345849. The cubic root of 1898134823 is about 1238.1569095748.

The spelling of 1898134823 in words is "one billion, eight hundred ninety-eight million, one hundred thirty-four thousand, eight hundred twenty-three".