6421457 has 8 divisors (see below), whose sum is σ = 7386816. Its totient is φ = 5468112.

The previous prime is 6421421. The next prime is 6421477. The reversal of 6421457 is 7541246.

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 6421457 - 2⁸ = 6421201 is a prime.

It is a super-2 number, since 2×6421457² = 82470220005698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421417) 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, 1823 + ... + 4020.

It is an arithmetic number, because the mean of its divisors is an integer number (923352).

Almost surely, 2^6421457 is an apocalyptic number.

It is an amenable number.

6421457 is a deficient number, since it is larger than the sum of its proper divisors (965359).

6421457 is a wasteful number, since it uses less digits than its factorization.

6421457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6007.

The product of its digits is 6720, while the sum is 29.

The square root of 6421457 is about 2534.0593915692. The cubic root of 6421457 is about 185.8708105869.

The spelling of 6421457 in words is "six million, four hundred twenty-one thousand, four hundred fifty-seven".