1820400056 has 16 divisors (see below), whose sum is σ = 3415881240. Its totient is φ = 909498400.

The previous prime is 1820400031. The next prime is 1820400077. The reversal of 1820400056 is 6500040281.

It is a junction number, because it is equal to n+sod(n) for n = 1820399998 and 1820400034.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76595 + ... + 97506.

Almost surely, 2^1820400056 is an apocalyptic number.

It is an amenable number.

1820400056 is a deficient number, since it is larger than the sum of its proper divisors (1595481184).

1820400056 is a wasteful number, since it uses less digits than its factorization.

1820400056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175414 (or 175410 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1820400056 is about 42666.1464864124. The cubic root of 1820400056 is about 1221.0186010743.

The spelling of 1820400056 in words is "one billion, eight hundred twenty million, four hundred thousand, fifty-six".