2503405 has 12 divisors (see below), whose sum is σ = 3110076. Its totient is φ = 1934400.

The previous prime is 2503387. The next prime is 2503409. The reversal of 2503405 is 5043052.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 808201 + 1695204 = 899^2 + 1302^2 .

It is not a de Polignac number, because 2503405 - 2⁵ = 2503373 is a prime.

It is a d-powerful number, because it can be written as 2²⁰ + 5⁶ + 0 + 3 + 4¹⁰ + 0 + 5⁸ .

It is a Duffinian number.

2503405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2503409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4545 + ... + 5065.

It is an arithmetic number, because the mean of its divisors is an integer number (259173).

2^2503405 is an apocalyptic number.

It is an amenable number.

2503405 is a deficient number, since it is larger than the sum of its proper divisors (606671).

2503405 is an equidigital number, since it uses as much as digits as its factorization.

2503405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 2503405 is about 1582.2152192417. The cubic root of 2503405 is about 135.7824701565.

Adding to 2503405 its reverse (5043052), we get a palindrome (7546457).

It can be divided in two parts, 250 and 3405, that added together give a triangular number (3655 = T₈₅).

The spelling of 2503405 in words is "two million, five hundred three thousand, four hundred five".