6403995 has 64 divisors (see below), whose sum is σ = 12700800. Its totient is φ = 3041280.

The previous prime is 6403993. The next prime is 6404003. The reversal of 6403995 is 5993046.

6403995 is a `hidden beast` number, since 640 + 3 + 9 + 9 + 5 = 666.

It is not a de Polignac number, because 6403995 - 2¹ = 6403993 is a prime.

It is a super-2 number, since 2×6403995² = 82022303920050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71911 + ... + 71999.

It is an arithmetic number, because the mean of its divisors is an integer number (198450).

Almost surely, 2^6403995 is an apocalyptic number.

6403995 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6403995 is a deficient number, since it is larger than the sum of its proper divisors (6296805).

6403995 is a wasteful number, since it uses less digits than its factorization.

6403995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 6403995 is about 2530.6115861586. The cubic root of 6403995 is about 185.7021768662.

The spelling of 6403995 in words is "six million, four hundred three thousand, nine hundred ninety-five".