642954243 has 16 divisors (see below), whose sum is σ = 904579200. Its totient is φ = 405092160.

The previous prime is 642954239. The next prime is 642954283. The reversal of 642954243 is 342459246.

It is not a de Polignac number, because 642954243 - 2² = 642954239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642954223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10423 + ... + 37343.

It is an arithmetic number, because the mean of its divisors is an integer number (56536200).

Almost surely, 2^642954243 is an apocalyptic number.

642954243 is a deficient number, since it is larger than the sum of its proper divisors (261624957).

642954243 is a wasteful number, since it uses less digits than its factorization.

642954243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27362.

The product of its digits is 207360, while the sum is 39.

The square root of 642954243 is about 25356.5424101947. The cubic root of 642954243 is about 863.0978250630.

The spelling of 642954243 in words is "six hundred forty-two million, nine hundred fifty-four thousand, two hundred forty-three".