1821434684 has 12 divisors (see below), whose sum is σ = 3197895624. Its totient is φ = 907750224.

The previous prime is 1821434647. The next prime is 1821434687. The reversal of 1821434684 is 4864341281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821434687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740399 + ... + 742854.

It is an arithmetic number, because the mean of its divisors is an integer number (266491302).

Almost surely, 2^1821434684 is an apocalyptic number.

It is an amenable number.

1821434684 is a deficient number, since it is larger than the sum of its proper divisors (1376460940).

1821434684 is a wasteful number, since it uses less digits than its factorization.

1821434684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483564 (or 1483562 counting only the distinct ones).

The product of its digits is 147456, while the sum is 41.

The square root of 1821434684 is about 42678.2694588241. The cubic root of 1821434684 is about 1221.2498800490.

The spelling of 1821434684 in words is "one billion, eight hundred twenty-one million, four hundred thirty-four thousand, six hundred eighty-four".