1821434699 has 16 divisors (see below), whose sum is σ = 2173481472. Its totient is φ = 1492432128.

The previous prime is 1821434687. The next prime is 1821434701. The reversal of 1821434699 is 9964341281.

It is a cyclic number.

It is not a de Polignac number, because 1821434699 - 2⁸ = 1821434443 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821434609) 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, 415292 + ... + 419654.

It is an arithmetic number, because the mean of its divisors is an integer number (135842592).

Almost surely, 2^1821434699 is an apocalyptic number.

1821434699 is a deficient number, since it is larger than the sum of its proper divisors (352046773).

1821434699 is a wasteful number, since it uses less digits than its factorization.

1821434699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986.

The product of its digits is 373248, while the sum is 47.

The square root of 1821434699 is about 42678.2696345576. The cubic root of 1821434699 is about 1221.2498834015.

The spelling of 1821434699 in words is "one billion, eight hundred twenty-one million, four hundred thirty-four thousand, six hundred ninety-nine".