1812727381 has 8 divisors (see below), whose sum is σ = 1819737920. Its totient is φ = 1805727168.

The previous prime is 1812727379. The next prime is 1812727409. The reversal of 1812727381 is 1837272181.

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

It is a cyclic number.

It is not a de Polignac number, because 1812727381 - 2¹ = 1812727379 is a prime.

It is a super-2 number, since 2×1812727381² = 6571961115654238322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812727321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587200 + ... + 590278.

It is an arithmetic number, because the mean of its divisors is an integer number (227467240).

Almost surely, 2^1812727381 is an apocalyptic number.

It is an amenable number.

1812727381 is a deficient number, since it is larger than the sum of its proper divisors (7010539).

1812727381 is a wasteful number, since it uses less digits than its factorization.

1812727381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163.

The product of its digits is 37632, while the sum is 40.

The square root of 1812727381 is about 42576.1362854827. The cubic root of 1812727381 is about 1219.3007237410.

The spelling of 1812727381 in words is "one billion, eight hundred twelve million, seven hundred twenty-seven thousand, three hundred eighty-one".