13491747 has 12 divisors (see below), whose sum is σ = 19963944. Its totient is φ = 8774880.

The previous prime is 13491743. The next prime is 13491811. The reversal of 13491747 is 74719431.

It is not a de Polignac number, because 13491747 - 2² = 13491743 is a prime.

It is a super-2 number, since 2×13491747² = 364054474224018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13491743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17913 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (1663662).

Almost surely, 2^13491747 is an apocalyptic number.

13491747 is a deficient number, since it is larger than the sum of its proper divisors (6472197).

13491747 is a wasteful number, since it uses less digits than its factorization.

13491747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36610 (or 36607 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 13491747 is about 3673.1113514295. Note that the first 3 decimals coincide. The cubic root of 13491747 is about 238.0616263454.

The spelling of 13491747 in words is "thirteen million, four hundred ninety-one thousand, seven hundred forty-seven".