1864989 has 18 divisors (see below), whose sum is σ = 3134430. Its totient is φ = 1065456.

The previous prime is 1864987. The next prime is 1865011. The reversal of 1864989 is 9894681.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 1764 = 1365^2 + 42^2 .

It is not a de Polignac number, because 1864989 - 2¹ = 1864987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864987) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1674 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (174135).

2^1864989 is an apocalyptic number.

It is an amenable number.

1864989 is a deficient number, since it is larger than the sum of its proper divisors (1269441).

1864989 is a wasteful number, since it uses less digits than its factorization.

1864989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249 (or 4239 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1864989 is about 1365.6460009827. The cubic root of 1864989 is about 123.0907519818.

The spelling of 1864989 in words is "one million, eight hundred sixty-four thousand, nine hundred eighty-nine".