642949242 has 64 divisors (see below), whose sum is σ = 1413672960. Its totient is φ = 193752000.

The previous prime is 642949193. The next prime is 642949267. The reversal of 642949242 is 242949246.

It is a junction number, because it is equal to n+sod(n) for n = 642949194 and 642949203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 930117 + ... + 930807.

It is an arithmetic number, because the mean of its divisors is an integer number (22088640).

Almost surely, 2^642949242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642949242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706836480).

642949242 is an abundant number, since it is smaller than the sum of its proper divisors (770723718).

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

642949242 is a wasteful number, since it uses less digits than its factorization.

642949242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939.

The product of its digits is 248832, while the sum is 42.

The square root of 642949242 is about 25356.4437964002. The cubic root of 642949242 is about 863.0955872866.

It can be divided in two parts, 64294 and 9242, that added together give a triangular number (73536 = T₃₈₃).

The spelling of 642949242 in words is "six hundred forty-two million, nine hundred forty-nine thousand, two hundred forty-two".