642351983 has 8 divisors (see below), whose sum is σ = 790587168. Its totient is φ = 508234464.

The previous prime is 642351979. The next prime is 642352033. The reversal of 642351983 is 389153246.

642351983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642351983 - 2² = 642351979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642351983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642350983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3529316 + ... + 3529497.

It is an arithmetic number, because the mean of its divisors is an integer number (98823396).

Almost surely, 2^642351983 is an apocalyptic number.

642351983 is a deficient number, since it is larger than the sum of its proper divisors (148235185).

642351983 is a wasteful number, since it uses less digits than its factorization.

642351983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058833.

The product of its digits is 155520, while the sum is 41.

The square root of 642351983 is about 25344.6637973361. The cubic root of 642351983 is about 862.8282508336.

The spelling of 642351983 in words is "six hundred forty-two million, three hundred fifty-one thousand, nine hundred eighty-three".