1985429 has 4 divisors (see below), whose sum is σ = 2071776. Its totient is φ = 1899084.

The previous prime is 1985419. The next prime is 1985441. The reversal of 1985429 is 9245891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9245891 = 1279 ⋅7229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1985392 and 1985401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43139 + ... + 43184.

It is an arithmetic number, because the mean of its divisors is an integer number (517944).

2^1985429 is an apocalyptic number.

It is an amenable number.

1985429 is a deficient number, since it is larger than the sum of its proper divisors (86347).

1985429 is an equidigital number, since it uses as much as digits as its factorization.

1985429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86346.

The product of its digits is 25920, while the sum is 38.

The square root of 1985429 is about 1409.0525185386. The cubic root of 1985429 is about 125.6853870877.

The spelling of 1985429 in words is "one million, nine hundred eighty-five thousand, four hundred twenty-nine".