1816421299 has 16 divisors (see below), whose sum is σ = 2383822080. Its totient is φ = 1340897760.

The previous prime is 1816421249. The next prime is 1816421309. The reversal of 1816421299 is 9921246181.

It is a cyclic number.

It is not a de Polignac number, because 1816421299 - 2¹⁵ = 1816388531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1816421249) 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, 619324 + ... + 622249.

It is an arithmetic number, because the mean of its divisors is an integer number (148988880).

Almost surely, 2^1816421299 is an apocalyptic number.

1816421299 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1816421299 is a deficient number, since it is larger than the sum of its proper divisors (567400781).

1816421299 is a wasteful number, since it uses less digits than its factorization.

1816421299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241610.

The product of its digits is 62208, while the sum is 43.

The square root of 1816421299 is about 42619.4943541098. The cubic root of 1816421299 is about 1220.1283791715.

The spelling of 1816421299 in words is "one billion, eight hundred sixteen million, four hundred twenty-one thousand, two hundred ninety-nine".