6420497 has 4 divisors (see below), whose sum is σ = 6426420. Its totient is φ = 6414576.

The previous prime is 6420487. The next prime is 6420511. The reversal of 6420497 is 7940246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3857296 + 2563201 = 1964^2 + 1601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818 + ... + 3675.

It is an arithmetic number, because the mean of its divisors is an integer number (1606605).

Almost surely, 2^6420497 is an apocalyptic number.

It is an amenable number.

6420497 is a deficient number, since it is larger than the sum of its proper divisors (5923).

6420497 is a wasteful number, since it uses less digits than its factorization.

6420497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5922.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 6420497 is about 2533.8699650929. The cubic root of 6420497 is about 185.8615476387.

The spelling of 6420497 in words is "six million, four hundred twenty thousand, four hundred ninety-seven".