13203891 has 24 divisors (see below), whose sum is σ = 20098624. Its totient is φ = 8660520.

The previous prime is 13203887. The next prime is 13203901. The reversal of 13203891 is 19830231.

It is not a de Polignac number, because 13203891 - 2² = 13203887 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13203811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15876 + ... + 16686.

Almost surely, 2^13203891 is an apocalyptic number.

13203891 is a deficient number, since it is larger than the sum of its proper divisors (6894733).

13203891 is an frugal number, since it uses more digits than its factorization.

13203891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 13203891 is about 3633.7158667128. The cubic root of 13203891 is about 236.3563693346.

The spelling of 13203891 in words is "thirteen million, two hundred three thousand, eight hundred ninety-one".