7857242 has 4 divisors (see below), whose sum is σ = 11785866. Its totient is φ = 3928620.

The previous prime is 7857233. The next prime is 7857263. The reversal of 7857242 is 2427587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5900041 + 1957201 = 2429^2 + 1399^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964309 + ... + 1964312.

Almost surely, 2^7857242 is an apocalyptic number.

7857242 is a deficient number, since it is larger than the sum of its proper divisors (3928624).

7857242 is a wasteful number, since it uses less digits than its factorization.

7857242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928623.

The product of its digits is 31360, while the sum is 35.

The square root of 7857242 is about 2803.0772376087. The cubic root of 7857242 is about 198.8032026657.

The spelling of 7857242 in words is "seven million, eight hundred fifty-seven thousand, two hundred forty-two".