1020439 has 4 divisors (see below), whose sum is σ = 1166224. Its totient is φ = 874656.

The previous prime is 1020431. The next prime is 1020451. The reversal of 1020439 is 9340201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020439 - 2³ = 1020431 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72882 + ... + 72895.

It is an arithmetic number, because the mean of its divisors is an integer number (291556).

2^1020439 is an apocalyptic number.

1020439 is a deficient number, since it is larger than the sum of its proper divisors (145785).

1020439 is an equidigital number, since it uses as much as digits as its factorization.

1020439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145784.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1020439 is about 1010.1678078418. The cubic root of 1020439 is about 100.6767103020.

It can be divided in two parts, 10 and 20439, that added together give a square (20449 = 143²).

The spelling of 1020439 in words is "one million, twenty thousand, four hundred thirty-nine".