6477921 has 16 divisors (see below), whose sum is σ = 9721600. Its totient is φ = 4262544.

The previous prime is 6477871. The next prime is 6477929. The reversal of 6477921 is 1297746.

It is a happy number.

6477921 is a `hidden beast` number, since 647 + 7 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 6477921 - 2⁶ = 6477857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6477929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (607600).

Almost surely, 2^6477921 is an apocalyptic number.

It is an amenable number.

6477921 is a deficient number, since it is larger than the sum of its proper divisors (3243679).

6477921 is a wasteful number, since it uses less digits than its factorization.

6477921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125 (or 3119 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 6477921 is about 2545.1760253468. The cubic root of 6477921 is about 186.4140101493.

The spelling of 6477921 in words is "six million, four hundred seventy-seven thousand, nine hundred twenty-one".