6347981 has 4 divisors (see below), whose sum is σ = 6388572. Its totient is φ = 6307392.

The previous prime is 6347959. The next prime is 6347983. The reversal of 6347981 is 1897436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1357225 + 4990756 = 1165^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 6347981 - 2¹⁰ = 6346957 is a prime.

It is a super-2 number, since 2×6347981² = 80593725552722, 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 (6347983) 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, 20060 + ... + 20373.

It is an arithmetic number, because the mean of its divisors is an integer number (1597143).

Almost surely, 2^6347981 is an apocalyptic number.

It is an amenable number.

6347981 is a deficient number, since it is larger than the sum of its proper divisors (40591).

6347981 is a wasteful number, since it uses less digits than its factorization.

6347981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40590.

The product of its digits is 36288, while the sum is 38.

The square root of 6347981 is about 2519.5199939671. The cubic root of 6347981 is about 185.1591617867.

The spelling of 6347981 in words is "six million, three hundred forty-seven thousand, nine hundred eighty-one".