1869861489 has 16 divisors (see below), whose sum is σ = 2615017728. Its totient is φ = 1187073792.

The previous prime is 1869861479. The next prime is 1869861517. The reversal of 1869861489 is 9841689681.

It is not a de Polignac number, because 1869861489 - 2¹⁷ = 1869730417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1869861419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173992 + ... + 184425.

It is an arithmetic number, because the mean of its divisors is an integer number (163438608).

Almost surely, 2^1869861489 is an apocalyptic number.

It is an amenable number.

1869861489 is a deficient number, since it is larger than the sum of its proper divisors (745156239).

1869861489 is a wasteful number, since it uses less digits than its factorization.

1869861489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358504.

The product of its digits is 5971968, while the sum is 60.

The square root of 1869861489 is about 43241.8950671684. The cubic root of 1869861489 is about 1231.9785480836.

The spelling of 1869861489 in words is "one billion, eight hundred sixty-nine million, eight hundred sixty-one thousand, four hundred eighty-nine".