842391438 has 24 divisors (see below), whose sum is σ = 1959850152. Its totient is φ = 240683184.

The previous prime is 842391397. The next prime is 842391461. The reversal of 842391438 is 834193248.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 842391438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1432345 + ... + 1432932.

It is an arithmetic number, because the mean of its divisors is an integer number (81660423).

Almost surely, 2^842391438 is an apocalyptic number.

842391438 is an abundant number, since it is smaller than the sum of its proper divisors (1117458714).

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

842391438 is a wasteful number, since it uses less digits than its factorization.

842391438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865296 (or 2865289 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 842391438 is about 29023.9803955281. The cubic root of 842391438 is about 944.4333502744.

The spelling of 842391438 in words is "eight hundred forty-two million, three hundred ninety-one thousand, four hundred thirty-eight".