1864771489 has 27 divisors (see below), whose sum is σ = 2252776401. Its totient is φ = 1539042120.

The previous prime is 1864771457. The next prime is 1864771499. The reversal of 1864771489 is 9841774681.

The square root of 1864771489 is 43183.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1864771489 - 2⁵ = 1864771457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1864771409) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9370612 + ... + 9370810.

It is an arithmetic number, because the mean of its divisors is an integer number (83436163).

Almost surely, 2^1864771489 is an apocalyptic number.

1864771489 is the 43183-rd square number.

1864771489 is the 21592-nd centered octagonal number.

It is an amenable number.

1864771489 is a deficient number, since it is larger than the sum of its proper divisors (388004912).

1864771489 is an frugal number, since it uses more digits than its factorization.

1864771489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 237 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 55.

The cubic root of 1864771489 is about 1230.8596649628.

The spelling of 1864771489 in words is "one billion, eight hundred sixty-four million, seven hundred seventy-one thousand, four hundred eighty-nine".