1811858212 has 24 divisors (see below), whose sum is σ = 3371046336. Its totient is φ = 850188768.

The previous prime is 1811858207. The next prime is 1811858219. The reversal of 1811858212 is 2128581181.

It is not an unprimeable number, because it can be changed into a prime (1811858219) 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, 180918 + ... + 190669.

It is an arithmetic number, because the mean of its divisors is an integer number (140460264).

Almost surely, 2^1811858212 is an apocalyptic number.

It is an amenable number.

1811858212 is a deficient number, since it is larger than the sum of its proper divisors (1559188124).

1811858212 is a wasteful number, since it uses less digits than its factorization.

1811858212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371667 (or 371665 counting only the distinct ones).

The product of its digits is 10240, while the sum is 37.

The square root of 1811858212 is about 42565.9278296621. The cubic root of 1811858212 is about 1219.1058152607.

The spelling of 1811858212 in words is "one billion, eight hundred eleven million, eight hundred fifty-eight thousand, two hundred twelve".