387790289 has 2 divisors, whose sum is σ = 387790290. Its totient is φ = 387790288.

The previous prime is 387790283. The next prime is 387790321. The reversal of 387790289 is 982097783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263088400 + 124701889 = 16220^2 + 11167^2 .

It is a cyclic number.

It is not a de Polignac number, because 387790289 - 2⁸ = 387790033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 387790289.

It is not a weakly prime, because it can be changed into another prime (387790283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193895144 + 193895145.

It is an arithmetic number, because the mean of its divisors is an integer number (193895145).

Almost surely, 2^387790289 is an apocalyptic number.

It is an amenable number.

387790289 is a deficient number, since it is larger than the sum of its proper divisors (1).

387790289 is an equidigital number, since it uses as much as digits as its factorization.

387790289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The square root of 387790289 is about 19692.3916526155. The cubic root of 387790289 is about 729.2318742200.

The spelling of 387790289 in words is "three hundred eighty-seven million, seven hundred ninety thousand, two hundred eighty-nine".