642443837 has 8 divisors (see below), whose sum is σ = 736836672. Its totient is φ = 548704800.

The previous prime is 642443819. The next prime is 642443849. The reversal of 642443837 is 738344246.

It is a happy number.

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

It is not a de Polignac number, because 642443837 - 2¹⁴ = 642427453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642443794 and 642443803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642443807) 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, 161339 + ... + 165272.

It is an arithmetic number, because the mean of its divisors is an integer number (92104584).

Almost surely, 2^642443837 is an apocalyptic number.

It is an amenable number.

642443837 is a deficient number, since it is larger than the sum of its proper divisors (94392835).

642443837 is a wasteful number, since it uses less digits than its factorization.

642443837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326899.

The product of its digits is 387072, while the sum is 41.

The square root of 642443837 is about 25346.4758299847. The cubic root of 642443837 is about 862.8693759752.

The spelling of 642443837 in words is "six hundred forty-two million, four hundred forty-three thousand, eight hundred thirty-seven".