6402021977 has 8 divisors (see below), whose sum is σ = 7080823176. Its totient is φ = 5749840512.

The previous prime is 6402021961. The next prime is 6402021979. The reversal of 6402021977 is 7791202046.

It can be written as a sum of positive squares in 4 ways, for example, as 587044441 + 5814977536 = 24229^2 + 76256^2 .

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

It is not a de Polignac number, because 6402021977 - 2⁴ = 6402021961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6402021977.

It is not an unprimeable number, because it can be changed into a prime (6402021979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6654428 + ... + 6655389.

It is an arithmetic number, because the mean of its divisors is an integer number (885102897).

Almost surely, 2^6402021977 is an apocalyptic number.

It is an amenable number.

6402021977 is a deficient number, since it is larger than the sum of its proper divisors (678801199).

6402021977 is a wasteful number, since it uses less digits than its factorization.

6402021977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13309867.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 6402021977 is about 80012.6363582653. The cubic root of 6402021977 is about 1856.8310375633.

The spelling of 6402021977 in words is "six billion, four hundred two million, twenty-one thousand, nine hundred seventy-seven".