1889647 has 2 divisors, whose sum is σ = 1889648. Its totient is φ = 1889646.

The previous prime is 1889621. The next prime is 1889651. The reversal of 1889647 is 7469881.

It is a strong prime.

It is an emirp because it is prime and its reverse (7469881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1889647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944823 + 944824.

It is an arithmetic number, because the mean of its divisors is an integer number (944824).

2^1889647 is an apocalyptic number.

1889647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889647 is an equidigital number, since it uses as much as digits as its factorization.

1889647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 1889647 is about 1374.6443176327. The cubic root of 1889647 is about 123.6308610879.

The spelling of 1889647 in words is "one million, eight hundred eighty-nine thousand, six hundred forty-seven".