1781848138 has 16 divisors (see below), whose sum is σ = 3055141440. Its totient is φ = 763513056.

The previous prime is 1781848129. The next prime is 1781848141. The reversal of 1781848138 is 8318481871.

It is a junction number, because it is equal to n+sod(n) for n = 1781848091 and 1781848100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135670 + ... + 148222.

It is an arithmetic number, because the mean of its divisors is an integer number (190946340).

Almost surely, 2^1781848138 is an apocalyptic number.

1781848138 is a deficient number, since it is larger than the sum of its proper divisors (1273293302).

1781848138 is a wasteful number, since it uses less digits than its factorization.

1781848138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22701.

The product of its digits is 344064, while the sum is 49.

The square root of 1781848138 is about 42211.9430730214. The cubic root of 1781848138 is about 1212.3375657699.

It can be divided in two parts, 17818 and 48138, that added together give a palindrome (65956).

The spelling of 1781848138 in words is "one billion, seven hundred eighty-one million, eight hundred forty-eight thousand, one hundred thirty-eight".