642486 has 16 divisors (see below), whose sum is σ = 1383984. Its totient is φ = 197664.

The previous prime is 642457. The next prime is 642487. The reversal of 642486 is 684246.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642487) by changing a digit.

642486 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4041 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (86499).

2⁶⁴²⁴⁸⁶ is an apocalyptic number.

642486 is an abundant number, since it is smaller than the sum of its proper divisors (741498).

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

642486 is a wasteful number, since it uses less digits than its factorization.

642486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8255.

The product of its digits is 9216, while the sum is 30.

The square root of 642486 is about 801.5522440864. The cubic root of 642486 is about 86.2888252004.

It can be divided in two parts, 642 and 486, that added together give a triangular number (1128 = T₄₇).

The spelling of 642486 in words is "six hundred forty-two thousand, four hundred eighty-six".