1820450428 has 24 divisors (see below), whose sum is σ = 3271282560. Its totient is φ = 886098480.

The previous prime is 1820450419. The next prime is 1820450441. The reversal of 1820450428 is 8240540281.

It is a junction number, because it is equal to n+sod(n) for n = 1820450393 and 1820450402.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13138 + ... + 61753.

It is an arithmetic number, because the mean of its divisors is an integer number (136303440).

Almost surely, 2^1820450428 is an apocalyptic number.

It is an amenable number.

1820450428 is a deficient number, since it is larger than the sum of its proper divisors (1450832132).

1820450428 is a wasteful number, since it uses less digits than its factorization.

1820450428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75057 (or 75055 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 1820450428 is about 42666.7367864007. The cubic root of 1820450428 is about 1221.0298631742.

The spelling of 1820450428 in words is "one billion, eight hundred twenty million, four hundred fifty thousand, four hundred twenty-eight".