642954 has 16 divisors (see below), whose sum is σ = 1384992. Its totient is φ = 197808.

The previous prime is 642953. The next prime is 642973. The reversal of 642954 is 459246.

It is a super-2 number, since 2×642954² = 826779692232, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642954.

It is not an unprimeable number, because it can be changed into a prime (642953) 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 in 7 ways as a sum of consecutive naturals, for example, 4044 + ... + 4199.

It is an arithmetic number, because the mean of its divisors is an integer number (86562).

2⁶⁴²⁹⁵⁴ is an apocalyptic number.

642954 is an abundant number, since it is smaller than the sum of its proper divisors (742038).

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

642954 is a wasteful number, since it uses less digits than its factorization.

642954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8261.

The product of its digits is 8640, while the sum is 30.

The square root of 642954 is about 801.8441245030. The cubic root of 642954 is about 86.3097716329.

It can be divided in two parts, 642 and 954, that added together give a triangular number (1596 = T₅₆).

The spelling of 642954 in words is "six hundred forty-two thousand, nine hundred fifty-four".