1820009477 has 32 divisors (see below), whose sum is σ = 2270830464. Its totient is φ = 1433088000.

The previous prime is 1820009467. The next prime is 1820009483. The reversal of 1820009477 is 7749000281.

It is a cyclic number.

It is not a de Polignac number, because 1820009477 - 2¹⁰ = 1820008453 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 1820009477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820009417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973898 + ... + 975764.

It is an arithmetic number, because the mean of its divisors is an integer number (70963452).

Almost surely, 2^1820009477 is an apocalyptic number.

1820009477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1820009477 is a deficient number, since it is larger than the sum of its proper divisors (450820987).

1820009477 is a wasteful number, since it uses less digits than its factorization.

1820009477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 1820009477 is about 42661.5690874117. The cubic root of 1820009477 is about 1220.9312689273.

The spelling of 1820009477 in words is "one billion, eight hundred twenty million, nine thousand, four hundred seventy-seven".