1800030999 has 12 divisors (see below), whose sum is σ = 2598862056. Its totient is φ = 1107711072.

The previous prime is 1800030983. The next prime is 1800031031. The reversal of 1800030999 is 9990300081.

It is not a de Polignac number, because 1800030999 - 2⁴ = 1800030983 is a prime.

It is a super-2 number, since 2×1800030999² = 6480223194721876002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800030929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1774672 + ... + 1775685.

It is an arithmetic number, because the mean of its divisors is an integer number (216571838).

Almost surely, 2^1800030999 is an apocalyptic number.

1800030999 is a deficient number, since it is larger than the sum of its proper divisors (798831057).

1800030999 is a wasteful number, since it uses less digits than its factorization.

1800030999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550386 (or 3550373 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1800030999 is about 42426.7721963385. The cubic root of 1800030999 is about 1216.4473821183.

The spelling of 1800030999 in words is "one billion, eight hundred million, thirty thousand, nine hundred ninety-nine".