13403855 has 4 divisors (see below), whose sum is σ = 16084632. Its totient is φ = 10723080.

The previous prime is 13403849. The next prime is 13403869. The reversal of 13403855 is 55830431.

13403855 = T₂₃₁₃ + T₂₃₁₄ + ... + T₂₃₁₇.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55830431 = 17 ⋅3284143.

It is not a de Polignac number, because 13403855 - 2²⁰ = 12355279 is a prime.

It is a super-2 number, since 2×13403855² = 359326657722050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340381 + ... + 1340390.

It is an arithmetic number, because the mean of its divisors is an integer number (4021158).

Almost surely, 2^13403855 is an apocalyptic number.

13403855 is a deficient number, since it is larger than the sum of its proper divisors (2680777).

13403855 is an equidigital number, since it uses as much as digits as its factorization.

13403855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680776.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 13403855 is about 3661.1275585535. The cubic root of 13403855 is about 237.5435488010.

The spelling of 13403855 in words is "thirteen million, four hundred three thousand, eight hundred fifty-five".