1820022749 has 4 divisors (see below), whose sum is σ = 1915813440. Its totient is φ = 1724232060.

The previous prime is 1820022739. The next prime is 1820022761. The reversal of 1820022749 is 9472200281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1820022749 - 2¹² = 1820018653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820022719) 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, 47895317 + ... + 47895354.

It is an arithmetic number, because the mean of its divisors is an integer number (478953360).

Almost surely, 2^1820022749 is an apocalyptic number.

1820022749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1820022749 is a deficient number, since it is larger than the sum of its proper divisors (95790691).

1820022749 is an equidigital number, since it uses as much as digits as its factorization.

1820022749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95790690.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1820022749 is about 42661.7246369623. The cubic root of 1820022749 is about 1220.9342367068.

The spelling of 1820022749 in words is "one billion, eight hundred twenty million, twenty-two thousand, seven hundred forty-nine".