1025505 has 24 divisors (see below), whose sum is σ = 1915368. Its totient is φ = 504576.

The previous prime is 1025503. The next prime is 1025509. The reversal of 1025505 is 5055201.

1025505 = 16² + 17² + ... + 145².

It can be written as a sum of positive squares in 4 ways, for example, as 33489 + 992016 = 183^2 + 996^2 .

It is not a de Polignac number, because 1025505 - 2¹ = 1025503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (79807).

2^1025505 is an apocalyptic number.

1025505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1025505 is the 585-th octagonal number.

It is an amenable number.

1025505 is a deficient number, since it is larger than the sum of its proper divisors (889863).

1025505 is a wasteful number, since it uses less digits than its factorization.

1025505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 1025505 is about 1012.6722075776. The cubic root of 1025505 is about 100.8430395380.

The spelling of 1025505 in words is "one million, twenty-five thousand, five hundred five".