6429981 has 8 divisors (see below), whose sum is σ = 8656960. Its totient is φ = 4244832.

The previous prime is 6429977. The next prime is 6430003. The reversal of 6429981 is 1899246.

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

It is not a de Polignac number, because 6429981 - 2² = 6429977 is a prime.

It is a super-2 number, since 2×6429981² = 82689311320722, 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 (6429931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10096 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (1082120).

Almost surely, 2^6429981 is an apocalyptic number.

It is an amenable number.

6429981 is a deficient number, since it is larger than the sum of its proper divisors (2226979).

6429981 is a wasteful number, since it uses less digits than its factorization.

6429981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20915.

The product of its digits is 31104, while the sum is 39.

The square root of 6429981 is about 2535.7407201841. The cubic root of 6429981 is about 185.9530173854.

The spelling of 6429981 in words is "six million, four hundred twenty-nine thousand, nine hundred eighty-one".