1816938 has 16 divisors (see below), whose sum is σ = 4037760. Its totient is φ = 605628.

The previous prime is 1816933. The next prime is 1816949. The reversal of 1816938 is 8396181.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16770 + ... + 16877.

It is an arithmetic number, because the mean of its divisors is an integer number (252360).

2^1816938 is an apocalyptic number.

1816938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1816938 is an abundant number, since it is smaller than the sum of its proper divisors (2220822).

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

1816938 is a wasteful number, since it uses less digits than its factorization.

1816938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33658 (or 33652 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1816938 is about 1347.9384258934. The cubic root of 1816938 is about 122.0244061179.

The spelling of 1816938 in words is "one million, eight hundred sixteen thousand, nine hundred thirty-eight".