1889997 has 8 divisors (see below), whose sum is σ = 2588256. Its totient is φ = 1225872.

The previous prime is 1889981. The next prime is 1889999. The reversal of 1889997 is 7999881.

1889997 = T₁₈₈ + T₁₈₉ + ... + T₂₆₁.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1889997 - 2⁴ = 1889981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8403 + ... + 8624.

It is an arithmetic number, because the mean of its divisors is an integer number (323532).

2^1889997 is an apocalyptic number.

It is an amenable number.

1889997 is a deficient number, since it is larger than the sum of its proper divisors (698259).

1889997 is a wasteful number, since it uses less digits than its factorization.

1889997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17067.

The product of its digits is 326592, while the sum is 51.

The square root of 1889997 is about 1374.7716173969. The cubic root of 1889997 is about 123.6384935770.

The spelling of 1889997 in words is "one million, eight hundred eighty-nine thousand, nine hundred ninety-seven".