11403855 has 32 divisors (see below), whose sum is σ = 21470400. Its totient is φ = 5723136.

The previous prime is 11403839. The next prime is 11403859. The reversal of 11403855 is 55830411.

It is not a de Polignac number, because 11403855 - 2⁴ = 11403839 is a prime.

It is a super-2 number, since 2×11403855² = 260095817722050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11403859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190 + ... + 4779.

It is an arithmetic number, because the mean of its divisors is an integer number (670950).

Almost surely, 2^11403855 is an apocalyptic number.

11403855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11403855 is a deficient number, since it is larger than the sum of its proper divisors (10066545).

11403855 is a wasteful number, since it uses less digits than its factorization.

11403855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 11403855 is about 3376.9594312043. The cubic root of 11403855 is about 225.0870774069.

The spelling of 11403855 in words is "eleven million, four hundred three thousand, eight hundred fifty-five".