1985623 has 2 divisors, whose sum is σ = 1985624. Its totient is φ = 1985622.

The previous prime is 1985593. The next prime is 1985639. The reversal of 1985623 is 3265891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1985623 - 2⁵ = 1985591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992811 + 992812.

It is an arithmetic number, because the mean of its divisors is an integer number (992812).

2^1985623 is an apocalyptic number.

1985623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985623 is an equidigital number, since it uses as much as digits as its factorization.

1985623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 1985623 is about 1409.1213574423. The cubic root of 1985623 is about 125.6894806062.

It can be divided in two parts, 198562 and 3, that multiplied together give a triangular number (595686 = T₁₀₉₁).

The spelling of 1985623 in words is "one million, nine hundred eighty-five thousand, six hundred twenty-three".