642452 has 12 divisors (see below), whose sum is σ = 1143156. Its totient is φ = 315840.

The previous prime is 642427. The next prime is 642457. The reversal of 642452 is 254246.

642452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 586756 = 236^2 + 766^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642457) by changing a digit.

642452 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 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1560.

It is an arithmetic number, because the mean of its divisors is an integer number (95263).

2⁶⁴²⁴⁵² is an apocalyptic number.

It is an amenable number.

642452 is a deficient number, since it is larger than the sum of its proper divisors (500704).

642452 is a wasteful number, since it uses less digits than its factorization.

642452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698 (or 2696 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 642452 is about 801.5310349575. The cubic root of 642452 is about 86.2873030548.

Adding to 642452 its reverse (254246), we get a palindrome (896698).

The spelling of 642452 in words is "six hundred forty-two thousand, four hundred fifty-two".