1025405 has 4 divisors (see below), whose sum is σ = 1230492. Its totient is φ = 820320.

The previous prime is 1025393. The next prime is 1025407. The reversal of 1025405 is 5045201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5045201 = 7 ⋅720743.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 375769 = 806^2 + 613^2 .

It is not a de Polignac number, because 1025405 - 2⁸ = 1025149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102536 + ... + 102545.

It is an arithmetic number, because the mean of its divisors is an integer number (307623).

2^1025405 is an apocalyptic number.

It is an amenable number.

1025405 is a deficient number, since it is larger than the sum of its proper divisors (205087).

1025405 is an equidigital number, since it uses as much as digits as its factorization.

1025405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205086.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 1025405 is about 1012.6228320554. The cubic root of 1025405 is about 100.8397615979.

The spelling of 1025405 in words is "one million, twenty-five thousand, four hundred five".