6403880421 has 6 divisors (see below), whose sum is σ = 9250049510. Its totient is φ = 4269253608.

The previous prime is 6403880411. The next prime is 6403880423. The reversal of 6403880421 is 1240883046.

6403880421 is a `hidden beast` number, since 640 + 3 + 8 + 8 + 0 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6160052196 + 243828225 = 78486^2 + 15615^2 .

It is not a de Polignac number, because 6403880421 - 2⁵ = 6403880389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403880423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355771126 + ... + 355771143.

Almost surely, 2^6403880421 is an apocalyptic number.

It is an amenable number.

6403880421 is a deficient number, since it is larger than the sum of its proper divisors (2846169089).

6403880421 is a wasteful number, since it uses less digits than its factorization.

6403880421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711542275 (or 711542272 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 6403880421 is about 80024.2489561758. The cubic root of 6403880421 is about 1857.0106934415.

The spelling of 6403880421 in words is "six billion, four hundred three million, eight hundred eighty thousand, four hundred twenty-one".