7042138 has 8 divisors (see below), whose sum is σ = 10624788. Its totient is φ = 3500544.

The previous prime is 7042129. The next prime is 7042183. The reversal of 7042138 is 8312407.

It can be written as a sum of positive squares in 2 ways, for example, as 6827769 + 214369 = 2613^2 + 463^2 .

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

It is a super-2 number, since 2×7042138² = 99183415222088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9831 + ... + 10522.

Almost surely, 2^7042138 is an apocalyptic number.

7042138 is a deficient number, since it is larger than the sum of its proper divisors (3582650).

7042138 is a wasteful number, since it uses less digits than its factorization.

7042138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20528.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 7042138 is about 2653.7026962341. The cubic root of 7042138 is about 191.6761939394.

The spelling of 7042138 in words is "seven million, forty-two thousand, one hundred thirty-eight".