6420957 has 8 divisors (see below), whose sum is σ = 8582784. Its totient is φ = 4269888.

The previous prime is 6420913. The next prime is 6420959. The reversal of 6420957 is 7590246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6420957 - 2⁶ = 6420893 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420959) 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, 1173 + ... + 3770.

It is an arithmetic number, because the mean of its divisors is an integer number (1072848).

Almost surely, 2^6420957 is an apocalyptic number.

It is an amenable number.

6420957 is a deficient number, since it is larger than the sum of its proper divisors (2161827).

6420957 is a wasteful number, since it uses less digits than its factorization.

6420957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 6420957 is about 2533.9607337131. The cubic root of 6420957 is about 185.8659862499.

The spelling of 6420957 in words is "six million, four hundred twenty thousand, nine hundred fifty-seven".