1812191850 has 144 divisors (see below), whose sum is σ = 5806449792. Its totient is φ = 396190080.

The previous prime is 1812191837. The next prime is 1812191863. The reversal of 1812191850 is 581912181.

It is an interprime number because it is at equal distance from previous prime (1812191837) and next prime (1812191863).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 59944 + ... + 84956.

It is an arithmetic number, because the mean of its divisors is an integer number (40322568).

Almost surely, 2^1812191850 is an apocalyptic number.

1812191850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812191850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2903224896).

1812191850 is an abundant number, since it is smaller than the sum of its proper divisors (3994257942).

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

1812191850 is a wasteful number, since it uses less digits than its factorization.

1812191850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25061 (or 25053 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 36.

The square root of 1812191850 is about 42569.8467227685. The cubic root of 1812191850 is about 1219.1806399278.

The spelling of 1812191850 in words is "one billion, eight hundred twelve million, one hundred ninety-one thousand, eight hundred fifty".