1820041429 has 4 divisors (see below), whose sum is σ = 1821916800. Its totient is φ = 1818166060.

The previous prime is 1820041427. The next prime is 1820041493. The reversal of 1820041429 is 9241400281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9241400281 = 1321 ⋅6995761.

It is a cyclic number.

It is not a de Polignac number, because 1820041429 - 2¹ = 1820041427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820041429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820041423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936229 + ... + 938170.

It is an arithmetic number, because the mean of its divisors is an integer number (455479200).

Almost surely, 2^1820041429 is an apocalyptic number.

It is an amenable number.

1820041429 is a deficient number, since it is larger than the sum of its proper divisors (1875371).

1820041429 is an equidigital number, since it uses as much as digits as its factorization.

1820041429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875370.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1820041429 is about 42661.9435680092. The cubic root of 1820041429 is about 1220.9384137559.

The spelling of 1820041429 in words is "one billion, eight hundred twenty million, forty-one thousand, four hundred twenty-nine".