642454 has 4 divisors (see below), whose sum is σ = 963684. Its totient is φ = 321226.

The previous prime is 642427. The next prime is 642457. The reversal of 642454 is 454246.

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

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.

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, 160612 + ... + 160615.

It is an arithmetic number, because the mean of its divisors is an integer number (240921).

2⁶⁴²⁴⁵⁴ is an apocalyptic number.

642454 is a deficient number, since it is larger than the sum of its proper divisors (321230).

642454 is a wasteful number, since it uses less digits than its factorization.

642454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321229.

The product of its digits is 3840, while the sum is 25.

The square root of 642454 is about 801.5322825688. The cubic root of 642454 is about 86.2873925942.

The spelling of 642454 in words is "six hundred forty-two thousand, four hundred fifty-four".