1025645 has 4 divisors (see below), whose sum is σ = 1230780. Its totient is φ = 820512.

The previous prime is 1025641. The next prime is 1025653. The reversal of 1025645 is 5465201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 175561 + 850084 = 419^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025645 - 2² = 1025641 is a prime.

It is a super-3 number, since 3×1025645³ = 3236774591760633375, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1025645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 102560 + ... + 102569.

It is an arithmetic number, because the mean of its divisors is an integer number (307695).

2^1025645 is an apocalyptic number.

It is an amenable number.

1025645 is a deficient number, since it is larger than the sum of its proper divisors (205135).

1025645 is an equidigital number, since it uses as much as digits as its factorization.

1025645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205134.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1025645 is about 1012.7413292643. The cubic root of 1025645 is about 100.8476282961.

It can be divided in two parts, 10256 and 45, that added together give a palindrome (10301).

The spelling of 1025645 in words is "one million, twenty-five thousand, six hundred forty-five".