13477981 has 8 divisors (see below), whose sum is σ = 14795424. Its totient is φ = 12175920.

The previous prime is 13477969. The next prime is 13477987. The reversal of 13477981 is 18977431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13477981 - 2⁵ = 13477949 is a prime.

It is a super-2 number, since 2×13477981² = 363311943672722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13477987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1966 + ... + 5551.

It is an arithmetic number, because the mean of its divisors is an integer number (1849428).

Almost surely, 2^13477981 is an apocalyptic number.

13477981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13477981 is a deficient number, since it is larger than the sum of its proper divisors (1317443).

13477981 is a wasteful number, since it uses less digits than its factorization.

13477981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7691.

The product of its digits is 42336, while the sum is 40.

The square root of 13477981 is about 3671.2369849957. The cubic root of 13477981 is about 237.9806318537.

The spelling of 13477981 in words is "thirteen million, four hundred seventy-seven thousand, nine hundred eighty-one".