1851812 has 6 divisors (see below), whose sum is σ = 3240678. Its totient is φ = 925904.

The previous prime is 1851809. The next prime is 1851821. The reversal of 1851812 is 2181581.

It can be written as a sum of positive squares in only one way, i.e., 1833316 + 18496 = 1354^2 + 136^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 231473 + ... + 231480.

It is an arithmetic number, because the mean of its divisors is an integer number (540113).

2^1851812 is an apocalyptic number.

It is an amenable number.

1851812 is a deficient number, since it is larger than the sum of its proper divisors (1388866).

1851812 is a wasteful number, since it uses less digits than its factorization.

1851812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462957 (or 462955 counting only the distinct ones).

The product of its digits is 640, while the sum is 26.

The square root of 1851812 is about 1360.8129922954. The cubic root of 1851812 is about 122.8001690555.

The spelling of 1851812 in words is "one million, eight hundred fifty-one thousand, eight hundred twelve".