7871042 has 4 divisors (see below), whose sum is σ = 11806566. Its totient is φ = 3935520.

The previous prime is 7871029. The next prime is 7871053. The reversal of 7871042 is 2401787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2401787 = 31 ⋅77477.

It can be written as a sum of positive squares in only one way, i.e., 5112121 + 2758921 = 2261^2 + 1661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7870996 and 7871014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1967759 + ... + 1967762.

Almost surely, 2^7871042 is an apocalyptic number.

7871042 is a deficient number, since it is larger than the sum of its proper divisors (3935524).

7871042 is a wasteful number, since it uses less digits than its factorization.

7871042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935523.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7871042 is about 2805.5377381172. The cubic root of 7871042 is about 198.9195233627.

The spelling of 7871042 in words is "seven million, eight hundred seventy-one thousand, forty-two".