1820472887 has 2 divisors, whose sum is σ = 1820472888. Its totient is φ = 1820472886.

The previous prime is 1820472881. The next prime is 1820472917. The reversal of 1820472887 is 7882740281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1820472887 - 2²⁰ = 1819424311 is a prime.

It is a super-2 number, since 2×1820472887² = 6628243064604229538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820472881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910236443 + 910236444.

It is an arithmetic number, because the mean of its divisors is an integer number (910236444).

Almost surely, 2^1820472887 is an apocalyptic number.

1820472887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820472887 is an equidigital number, since it uses as much as digits as its factorization.

1820472887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 401408, while the sum is 47.

The square root of 1820472887 is about 42666.9999765627. Note that the first 4 decimals coincide. The cubic root of 1820472887 is about 1221.0348844584.

The spelling of 1820472887 in words is "one billion, eight hundred twenty million, four hundred seventy-two thousand, eight hundred eighty-seven".