1945889 has 4 divisors (see below), whose sum is σ = 2122800. Its totient is φ = 1768980.

The previous prime is 1945883. The next prime is 1945891. The reversal of 1945889 is 9885491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1945889 - 2⁴ = 1945873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1945883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88439 + ... + 88460.

It is an arithmetic number, because the mean of its divisors is an integer number (530700).

2^1945889 is an apocalyptic number.

It is an amenable number.

1945889 is a deficient number, since it is larger than the sum of its proper divisors (176911).

1945889 is a wasteful number, since it uses less digits than its factorization.

1945889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176910.

The product of its digits is 103680, while the sum is 44.

The square root of 1945889 is about 1394.9512536286. The cubic root of 1945889 is about 124.8454409708.

The spelling of 1945889 in words is "one million, nine hundred forty-five thousand, eight hundred eighty-nine".