2387985781 has 2 divisors, whose sum is σ = 2387985782. Its totient is φ = 2387985780.

The previous prime is 2387985763. The next prime is 2387985799. The reversal of 2387985781 is 1875897832.

It is a balanced prime because it is at equal distance from previous prime (2387985763) and next prime (2387985799).

It can be written as a sum of positive squares in only one way, i.e., 1779574225 + 608411556 = 42185^2 + 24666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2387985781 - 2¹⁷ = 2387854709 is a prime.

It is a super-2 number, since 2×2387985781² = 11404952180516359922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2387985751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1193992890 + 1193992891.

It is an arithmetic number, because the mean of its divisors is an integer number (1193992891).

Almost surely, 2^2387985781 is an apocalyptic number.

It is an amenable number.

2387985781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2387985781 is an equidigital number, since it uses as much as digits as its factorization.

2387985781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 58.

The square root of 2387985781 is about 48867.0214050335. The cubic root of 2387985781 is about 1336.6280746302.

The spelling of 2387985781 in words is "two billion, three hundred eighty-seven million, nine hundred eighty-five thousand, seven hundred eighty-one".