13903805 has 4 divisors (see below), whose sum is σ = 16684572. Its totient is φ = 11123040.

The previous prime is 13903783. The next prime is 13903829. The reversal of 13903805 is 50830931.

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 2627641 + 11276164 = 1621^2 + 3358^2 .

It is not a de Polignac number, because 13903805 - 2¹⁴ = 13887421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390376 + ... + 1390385.

It is an arithmetic number, because the mean of its divisors is an integer number (4171143).

Almost surely, 2^13903805 is an apocalyptic number.

It is an amenable number.

13903805 is a deficient number, since it is larger than the sum of its proper divisors (2780767).

13903805 is an equidigital number, since it uses as much as digits as its factorization.

13903805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780766.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 13903805 is about 3728.7806317884. The cubic root of 13903805 is about 240.4609486172.

The spelling of 13903805 in words is "thirteen million, nine hundred three thousand, eight hundred five".