13403961 has 20 divisors (see below), whose sum is σ = 20196352. Its totient is φ = 8858808.

The previous prime is 13403893. The next prime is 13403969. The reversal of 13403961 is 16930431.

13403961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13403961 - 2⁹ = 13403449 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 (13403969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9636 + ... + 10938.

Almost surely, 2^13403961 is an apocalyptic number.

It is an amenable number.

13403961 is a deficient number, since it is larger than the sum of its proper divisors (6792391).

13403961 is a wasteful number, since it uses less digits than its factorization.

13403961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 13403961 is about 3661.1420349394. The cubic root of 13403961 is about 237.5441749778.

The spelling of 13403961 in words is "thirteen million, four hundred three thousand, nine hundred sixty-one".