6391242 has 72 divisors (see below), whose sum is σ = 16443648. Its totient is φ = 1778400.

The previous prime is 6391241. The next prime is 6391243. The reversal of 6391242 is 2421936.

6391242 is a `hidden beast` number, since 639 + 1 + 24 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (6391241) and next prime (6391243).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6391241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33367 + ... + 33557.

It is an arithmetic number, because the mean of its divisors is an integer number (228384).

Almost surely, 2^6391242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6391242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8221824).

6391242 is an abundant number, since it is smaller than the sum of its proper divisors (10052406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6391242 is a wasteful number, since it uses less digits than its factorization.

6391242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 220 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 6391242 is about 2528.0905838201. The cubic root of 6391242 is about 185.5788250280.

It can be divided in two parts, 639 and 1242, that added together give a palindrome (1881).

The spelling of 6391242 in words is "six million, three hundred ninety-one thousand, two hundred forty-two".