1020765 has 16 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 512256.

The previous prime is 1020757. The next prime is 1020779. The reversal of 1020765 is 5670201.

It is not a de Polignac number, because 1020765 - 2³ = 1020757 is a prime.

It is a super-2 number, since 2×1020765² = 2083922370450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1747 + ... + 2256.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1020765 is an apocalyptic number.

1020765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020765 is a deficient number, since it is larger than the sum of its proper divisors (708963).

1020765 is a wasteful number, since it uses less digits than its factorization.

1020765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 1020765 is about 1010.3291542859. The cubic root of 1020765 is about 100.6874302350.

Adding to 1020765 its reverse (5670201), we get a palindrome (6690966).

The spelling of 1020765 in words is "one million, twenty thousand, seven hundred sixty-five".