7857942 has 32 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 2499360.

The previous prime is 7857917. The next prime is 7857943. The reversal of 7857942 is 2497587.

It is a junction number, because it is equal to n+sod(n) for n = 7857894 and 7857903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7857943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15184 + ... + 15692.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^7857942 is an apocalyptic number.

7857942 is an abundant number, since it is smaller than the sum of its proper divisors (8592618).

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

7857942 is a wasteful number, since it uses less digits than its factorization.

7857942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its digits is 141120, while the sum is 42.

The square root of 7857942 is about 2803.2020976020. The cubic root of 7857942 is about 198.8091062686.

The spelling of 7857942 in words is "seven million, eight hundred fifty-seven thousand, nine hundred forty-two".