642854 has 4 divisors (see below), whose sum is σ = 964284. Its totient is φ = 321426.

The previous prime is 642853. The next prime is 642869. The reversal of 642854 is 458246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458246 = 2 ⋅229123.

It is a super-2 number, since 2×642854² = 826522530632, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642854.

It is not an unprimeable number, because it can be changed into a prime (642853) 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, 160712 + ... + 160715.

It is an arithmetic number, because the mean of its divisors is an integer number (241071).

2⁶⁴²⁸⁵⁴ is an apocalyptic number.

642854 is a deficient number, since it is larger than the sum of its proper divisors (321430).

642854 is a wasteful number, since it uses less digits than its factorization.

642854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321429.

The product of its digits is 7680, while the sum is 29.

The square root of 642854 is about 801.7817658191. The cubic root of 642854 is about 86.3052967536.

The spelling of 642854 in words is "six hundred forty-two thousand, eight hundred fifty-four".