1020456 has 24 divisors (see below), whose sum is σ = 2763930. Its totient is φ = 340128.

The previous prime is 1020451. The next prime is 1020457. The reversal of 1020456 is 6540201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 695556 + 324900 = 834^2 + 570^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1020451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7015 + ... + 7158.

2^1020456 is an apocalyptic number.

It is an amenable number.

1020456 is an abundant number, since it is smaller than the sum of its proper divisors (1743474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020456 is a wasteful number, since it uses less digits than its factorization.

1020456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14185 (or 14178 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1020456 is about 1010.1762222504. The cubic root of 1020456 is about 100.6772693733.

Adding to 1020456 its reverse (6540201), we get a palindrome (7560657).

The spelling of 1020456 in words is "one million, twenty thousand, four hundred fifty-six".