6403881 has 8 divisors (see below), whose sum is σ = 9314784. Its totient is φ = 3881120.

The previous prime is 6403877. The next prime is 6403889. The reversal of 6403881 is 1883046.

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 6403881 - 2² = 6403877 is a prime.

It is a super-2 number, since 2×6403881² = 82019383724322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6403889) 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, 96996 + ... + 97061.

It is an arithmetic number, because the mean of its divisors is an integer number (1164348).

Almost surely, 2^6403881 is an apocalyptic number.

It is an amenable number.

6403881 is a deficient number, since it is larger than the sum of its proper divisors (2910903).

6403881 is a wasteful number, since it uses less digits than its factorization.

6403881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194071.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 6403881 is about 2530.5890618589. The cubic root of 6403881 is about 185.7010749408.

The spelling of 6403881 in words is "six million, four hundred three thousand, eight hundred eighty-one".