1894389 has 20 divisors (see below), whose sum is σ = 2957856. Its totient is φ = 1078392.

The previous prime is 1894381. The next prime is 1894393. The reversal of 1894389 is 9834981.

It is not a de Polignac number, because 1894389 - 2³ = 1894381 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

1894389 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1894389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894381) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7072 + ... + 7334.

2^1894389 is an apocalyptic number.

It is an amenable number.

1894389 is a deficient number, since it is larger than the sum of its proper divisors (1063467).

1894389 is an frugal number, since it uses more digits than its factorization.

1894389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 273 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 1894389 is about 1376.3680467084. The cubic root of 1894389 is about 123.7341904097.

Adding to 1894389 its sum of digits (42), we get a triangular number (1894431 = T₁₉₄₆).

The spelling of 1894389 in words is "one million, eight hundred ninety-four thousand, three hundred eighty-nine".