1821434686 has 4 divisors (see below), whose sum is σ = 2732152032. Its totient is φ = 910717342.

The previous prime is 1821434647. The next prime is 1821434687. The reversal of 1821434686 is 6864341281.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 455358670 + ... + 455358673.

It is an arithmetic number, because the mean of its divisors is an integer number (683038008).

Almost surely, 2^1821434686 is an apocalyptic number.

1821434686 is a deficient number, since it is larger than the sum of its proper divisors (910717346).

1821434686 is an equidigital number, since it uses as much as digits as its factorization.

1821434686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910717345.

The product of its digits is 221184, while the sum is 43.

The square root of 1821434686 is about 42678.2694822553. The cubic root of 1821434686 is about 1221.2498804960.

It can be divided in two parts, 18214 and 34686, that added together give a square (52900 = 230²).

The spelling of 1821434686 in words is "one billion, eight hundred twenty-one million, four hundred thirty-four thousand, six hundred eighty-six".