1810990990 has 8 divisors (see below), whose sum is σ = 3259783800. Its totient is φ = 724396392.

The previous prime is 1810990969. The next prime is 1810990999. The reversal of 1810990990 is 990990181.

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

It is a super-2 number, since 2×1810990990² = 6559376731722360200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1810990990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1810990999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90549540 + ... + 90549559.

It is an arithmetic number, because the mean of its divisors is an integer number (407472975).

Almost surely, 2^1810990990 is an apocalyptic number.

1810990990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1810990990 is a deficient number, since it is larger than the sum of its proper divisors (1448792810).

1810990990 is a wasteful number, since it uses less digits than its factorization.

1810990990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181099106.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 1810990990 is about 42555.7398008776. The cubic root of 1810990990 is about 1218.9112812553.

The spelling of 1810990990 in words is "one billion, eight hundred ten million, nine hundred ninety thousand, nine hundred ninety".