1808230921 has 16 divisors (see below), whose sum is σ = 2099722240. Its totient is φ = 1525165200.

The previous prime is 1808230909. The next prime is 1808230933. The reversal of 1808230921 is 1290328081.

It is an interprime number because it is at equal distance from previous prime (1808230909) and next prime (1808230933).

It is a cyclic number.

It is not a de Polignac number, because 1808230921 - 2¹³ = 1808222729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1808230621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164446 + ... + 175096.

It is an arithmetic number, because the mean of its divisors is an integer number (131232640).

Almost surely, 2^1808230921 is an apocalyptic number.

It is an amenable number.

1808230921 is a deficient number, since it is larger than the sum of its proper divisors (291491319).

1808230921 is a wasteful number, since it uses less digits than its factorization.

1808230921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11044.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1808230921 is about 42523.2985667857. The cubic root of 1808230921 is about 1218.2917328358.

The spelling of 1808230921 in words is "one billion, eight hundred eight million, two hundred thirty thousand, nine hundred twenty-one".