6420742 has 4 divisors (see below), whose sum is σ = 9631116. Its totient is φ = 3210370.

The previous prime is 6420737. The next prime is 6420763. The reversal of 6420742 is 2470246.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605184 + ... + 1605187.

It is an arithmetic number, because the mean of its divisors is an integer number (2407779).

Almost surely, 2^6420742 is an apocalyptic number.

6420742 is a deficient number, since it is larger than the sum of its proper divisors (3210374).

6420742 is a wasteful number, since it uses less digits than its factorization.

6420742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210373.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 6420742 is about 2533.9183096540. The cubic root of 6420742 is about 185.8639117080.

Adding to 6420742 its reverse (2470246), we get a palindrome (8890988).

The spelling of 6420742 in words is "six million, four hundred twenty thousand, seven hundred forty-two".