1894639 has 2 divisors, whose sum is σ = 1894640. Its totient is φ = 1894638.

The previous prime is 1894631. The next prime is 1894643. The reversal of 1894639 is 9364981.

It is a strong prime.

It is an emirp because it is prime and its reverse (9364981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1894639 - 2³ = 1894631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1894631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947319 + 947320.

It is an arithmetic number, because the mean of its divisors is an integer number (947320).

2^1894639 is an apocalyptic number.

1894639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894639 is an equidigital number, since it uses as much as digits as its factorization.

1894639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 1894639 is about 1376.4588624438. The cubic root of 1894639 is about 123.7396331825.

The spelling of 1894639 in words is "one million, eight hundred ninety-four thousand, six hundred thirty-nine".