1812009690 has 224 divisors, whose sum is σ = 5201490816. Its totient is φ = 453340800.

The previous prime is 1812009679. The next prime is 1812009701. The reversal of 1812009690 is 969002181.

It is an interprime number because it is at equal distance from previous prime (1812009679) and next prime (1812009701).

It is a super-2 number, since 2×1812009690² = 6566758233307792200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 16934617 + ... + 16934723.

Almost surely, 2^1812009690 is an apocalyptic number.

1812009690 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 1812009690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2600745408).

1812009690 is an abundant number, since it is smaller than the sum of its proper divisors (3389481126).

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

1812009690 is a wasteful number, since it uses less digits than its factorization.

1812009690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 1812009690 is about 42567.7071264122. The cubic root of 1812009690 is about 1219.1397882216.

The spelling of 1812009690 in words is "one billion, eight hundred twelve million, nine thousand, six hundred ninety".