6420242 has 4 divisors (see below), whose sum is σ = 9630366. Its totient is φ = 3210120.

The previous prime is 6420221. The next prime is 6420259. The reversal of 6420242 is 2420246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2420246 = 2 ⋅1210123.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 1079521 = 2311^2 + 1039^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605059 + ... + 1605062.

Almost surely, 2^6420242 is an apocalyptic number.

6420242 is a deficient number, since it is larger than the sum of its proper divisors (3210124).

6420242 is a wasteful number, since it uses less digits than its factorization.

6420242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210123.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 6420242 is about 2533.8196463048. The cubic root of 6420242 is about 185.8590870128.

Adding to 6420242 its reverse (2420246), we get a palindrome (8840488).

The spelling of 6420242 in words is "six million, four hundred twenty thousand, two hundred forty-two".