7842138 has 16 divisors (see below), whose sum is σ = 16018560. Its totient is φ = 2558336.

The previous prime is 7842127. The next prime is 7842139. The reversal of 7842138 is 8312487.

It is a super-2 number, since 2×7842138² = 122998256822088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7842099 and 7842108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7842139) 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, 13623 + ... + 14186.

It is an arithmetic number, because the mean of its divisors is an integer number (1001160).

Almost surely, 2^7842138 is an apocalyptic number.

7842138 is an abundant number, since it is smaller than the sum of its proper divisors (8176422).

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

7842138 is a wasteful number, since it uses less digits than its factorization.

7842138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27861.

The product of its digits is 10752, while the sum is 33.

The square root of 7842138 is about 2800.3817596892. The cubic root of 7842138 is about 198.6757342878.

The spelling of 7842138 in words is "seven million, eight hundred forty-two thousand, one hundred thirty-eight".