13149947 has 4 divisors (see below), whose sum is σ = 13216896. Its totient is φ = 13083000.

The previous prime is 13149937. The next prime is 13149973. The reversal of 13149947 is 74994131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13149947 - 2⁴ = 13149931 is a prime.

It is a super-2 number, since 2×13149947² = 345842212205618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13149947.

It is not an unprimeable number, because it can be changed into a prime (13149937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33179 + ... + 33572.

It is an arithmetic number, because the mean of its divisors is an integer number (3304224).

Almost surely, 2^13149947 is an apocalyptic number.

13149947 is a deficient number, since it is larger than the sum of its proper divisors (66949).

13149947 is an equidigital number, since it uses as much as digits as its factorization.

13149947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66948.

The product of its digits is 27216, while the sum is 38.

The square root of 13149947 is about 3626.2855651479. The cubic root of 13149947 is about 236.0340549822.

The spelling of 13149947 in words is "thirteen million, one hundred forty-nine thousand, nine hundred forty-seven".