1655389 has 2 divisors, whose sum is σ = 1655390. Its totient is φ = 1655388.

The previous prime is 1655377. The next prime is 1655393. The reversal of 1655389 is 9835561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 412164 = 1115^2 + 642^2 .

It is an emirp because it is prime and its reverse (9835561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655389 - 2¹¹ = 1653341 is a prime.

1655389 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827694 + 827695.

It is an arithmetic number, because the mean of its divisors is an integer number (827695).

2^1655389 is an apocalyptic number.

It is an amenable number.

1655389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655389 is an equidigital number, since it uses as much as digits as its factorization.

1655389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 1655389 is about 1286.6192132873. The cubic root of 1655389 is about 118.2950816433.

The spelling of 1655389 in words is "one million, six hundred fifty-five thousand, three hundred eighty-nine".