6420479 has 6 divisors (see below), whose sum is σ = 6952536. Its totient is φ = 5926440.

The previous prime is 6420467. The next prime is 6420487. The reversal of 6420479 is 9740246.

It is not a de Polignac number, because 6420479 - 2¹² = 6416383 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 (6420079) 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, 18827 + ... + 19164.

It is an arithmetic number, because the mean of its divisors is an integer number (1158756).

Almost surely, 2^6420479 is an apocalyptic number.

6420479 is a deficient number, since it is larger than the sum of its proper divisors (532057).

6420479 is a wasteful number, since it uses less digits than its factorization.

6420479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38017 (or 38004 counting only the distinct ones).

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

The square root of 6420479 is about 2533.8664132112. The cubic root of 6420479 is about 185.8613739496.

The spelling of 6420479 in words is "six million, four hundred twenty thousand, four hundred seventy-nine".