1912489866 has 80 divisors (see below), whose sum is σ = 4905250944. Its totient is φ = 545571936.

The previous prime is 1912489861. The next prime is 1912489871. The reversal of 1912489866 is 6689842191.

It is an interprime number because it is at equal distance from previous prime (1912489861) and next prime (1912489871).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1912489861) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1238691 + ... + 1240233.

Almost surely, 2^1912489866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1912489866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2452625472).

1912489866 is an abundant number, since it is smaller than the sum of its proper divisors (2992761078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1912489866 is a wasteful number, since it uses less digits than its factorization.

1912489866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657 (or 2648 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 1912489866 is about 43732.0233467421. The cubic root of 1912489866 is about 1241.2703478743.

The spelling of 1912489866 in words is "one billion, nine hundred twelve million, four hundred eighty-nine thousand, eight hundred sixty-six".