6405971 has 8 divisors (see below), whose sum is σ = 7526064. Its totient is φ = 5375520.

The previous prime is 6405943. The next prime is 6405979. The reversal of 6405971 is 1795046.

It is a happy number.

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 6405971 - 2¹⁸ = 6143827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6405979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22256 + ... + 22541.

It is an arithmetic number, because the mean of its divisors is an integer number (940758).

Almost surely, 2^6405971 is an apocalyptic number.

6405971 is a deficient number, since it is larger than the sum of its proper divisors (1120093).

6405971 is a wasteful number, since it uses less digits than its factorization.

6405971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44821.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 6405971 is about 2531.0019755030. The cubic root of 6405971 is about 185.7212748285.

The spelling of 6405971 in words is "six million, four hundred five thousand, nine hundred seventy-one".