2258405 has 4 divisors (see below), whose sum is σ = 2710092. Its totient is φ = 1806720.

The previous prime is 2258387. The next prime is 2258407. The reversal of 2258405 is 5048522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5048522 = 2 ⋅2524261.

It can be written as a sum of positive squares in 2 ways, for example, as 743044 + 1515361 = 862^2 + 1231^2 .

It is not a de Polignac number, because 2258405 - 2⁸ = 2258149 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 (2258407) 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, 225836 + ... + 225845.

It is an arithmetic number, because the mean of its divisors is an integer number (677523).

2^2258405 is an apocalyptic number.

It is an amenable number.

2258405 is a deficient number, since it is larger than the sum of its proper divisors (451687).

2258405 is an equidigital number, since it uses as much as digits as its factorization.

2258405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451686.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2258405 is about 1502.7990550969. The cubic root of 2258405 is about 131.2000323778.

The spelling of 2258405 in words is "two million, two hundred fifty-eight thousand, four hundred five".