1806927138 has 48 divisors (see below), whose sum is σ = 3977004096. Its totient is φ = 592801440.

The previous prime is 1806927131. The next prime is 1806927149. The reversal of 1806927138 is 8317296081.

It is a junction number, because it is equal to n+sod(n) for n = 1806927093 and 1806927102.

It is not an unprimeable number, because it can be changed into a prime (1806927131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1209520 + ... + 1211012.

It is an arithmetic number, because the mean of its divisors is an integer number (82854252).

Almost surely, 2^1806927138 is an apocalyptic number.

1806927138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1806927138 is an abundant number, since it is smaller than the sum of its proper divisors (2170076958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1806927138 is a wasteful number, since it uses less digits than its factorization.

1806927138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519 (or 2516 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1806927138 is about 42507.9655829352. The cubic root of 1806927138 is about 1217.9988554269.

The spelling of 1806927138 in words is "one billion, eight hundred six million, nine hundred twenty-seven thousand, one hundred thirty-eight".