11405257 has 4 divisors (see below), whose sum is σ = 11683476. Its totient is φ = 11127040.

The previous prime is 11405243. The next prime is 11405297. The reversal of 11405257 is 75250411.

11405257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 881721 + 10523536 = 939^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 11405257 - 2⁷ = 11405129 is a prime.

It is a super-3 number, since 3×11405257³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11405297) 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, 139048 + ... + 139129.

It is an arithmetic number, because the mean of its divisors is an integer number (2920869).

Almost surely, 2^11405257 is an apocalyptic number.

It is an amenable number.

11405257 is a deficient number, since it is larger than the sum of its proper divisors (278219).

11405257 is an equidigital number, since it uses as much as digits as its factorization.

11405257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278218.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 11405257 is about 3377.1670080113. The cubic root of 11405257 is about 225.0963011636.

Adding to 11405257 its reverse (75250411), we get a palindrome (86655668).

The spelling of 11405257 in words is "eleven million, four hundred five thousand, two hundred fifty-seven".