2025405 has 24 divisors (see below), whose sum is σ = 3642912. Its totient is φ = 1079568.

The previous prime is 2025377. The next prime is 2025409. The reversal of 2025405 is 5045202.

It is not a de Polignac number, because 2025405 - 2⁶ = 2025341 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2025409) 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, 382 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (151788).

2^2025405 is an apocalyptic number.

It is an amenable number.

2025405 is a deficient number, since it is larger than the sum of its proper divisors (1617507).

2025405 is an equidigital number, since it uses as much as digits as its factorization.

2025405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 2025405 is about 1423.1672424561. The cubic root of 2025405 is about 126.5233335597.

It can be divided in two parts, 20 and 25405, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 2025405 in words is "two million, twenty-five thousand, four hundred five".