842121438 has 8 divisors (see below), whose sum is σ = 1684242888. Its totient is φ = 280707144.

The previous prime is 842121437. The next prime is 842121463. The reversal of 842121438 is 834121248.

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

842121438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 842121399 and 842121408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842121433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70176781 + ... + 70176792.

It is an arithmetic number, because the mean of its divisors is an integer number (210530361).

Almost surely, 2^842121438 is an apocalyptic number.

842121438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

842121438 is a wasteful number, since it uses less digits than its factorization.

842121438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140353578.

The product of its digits is 12288, while the sum is 33.

The square root of 842121438 is about 29019.3286965774. The cubic root of 842121438 is about 944.3324374677.

The spelling of 842121438 in words is "eight hundred forty-two million, one hundred twenty-one thousand, four hundred thirty-eight".