1820398032 has 60 divisors (see below), whose sum is σ = 5218861284. Its totient is φ = 591997440.

The previous prime is 1820398009. The next prime is 1820398057. The reversal of 1820398032 is 2308930281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34152336 + 1786245696 = 5844^2 + 42264^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148263 + ... + 160070.

Almost surely, 2^1820398032 is an apocalyptic number.

1820398032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1820398032 is an abundant number, since it is smaller than the sum of its proper divisors (3398463252).

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

1820398032 is a wasteful number, since it uses less digits than its factorization.

1820398032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308388 (or 308379 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1820398032 is about 42666.1227673666. The cubic root of 1820398032 is about 1221.0181485469.

The spelling of 1820398032 in words is "one billion, eight hundred twenty million, three hundred ninety-eight thousand, thirty-two".