1800816402 has 32 divisors (see below), whose sum is σ = 4490348544. Its totient is φ = 467744400.

The previous prime is 1800816401. The next prime is 1800816403. The reversal of 1800816402 is 2046180081.

It is an interprime number because it is at equal distance from previous prime (1800816401) and next prime (1800816403).

It is a self number, because there is not a number n which added to its sum of digits gives 1800816402.

It is not an unprimeable number, because it can be changed into a prime (1800816401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1948474 + ... + 1949397.

It is an arithmetic number, because the mean of its divisors is an integer number (140323392).

Almost surely, 2^1800816402 is an apocalyptic number.

1800816402 is an abundant number, since it is smaller than the sum of its proper divisors (2689532142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1800816402 is a wasteful number, since it uses less digits than its factorization.

1800816402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897894.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 1800816402 is about 42436.0271703184. The cubic root of 1800816402 is about 1216.6242795350.

Adding to 1800816402 its reverse (2046180081), we get a palindrome (3846996483).

The spelling of 1800816402 in words is "one billion, eight hundred million, eight hundred sixteen thousand, four hundred two".