7942409851 has 4 divisors (see below), whose sum is σ = 7972609392. Its totient is φ = 7912210312.

The previous prime is 7942409819. The next prime is 7942409857. The reversal of 7942409851 is 1589042497.

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

It is a cyclic number.

It is not a de Polignac number, because 7942409851 - 2⁵ = 7942409819 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7942409795 and 7942409804.

It is not an unprimeable number, because it can be changed into a prime (7942409857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15099376 + ... + 15099901.

It is an arithmetic number, because the mean of its divisors is an integer number (1993152348).

Almost surely, 2^7942409851 is an apocalyptic number.

7942409851 is a deficient number, since it is larger than the sum of its proper divisors (30199541).

7942409851 is a wasteful number, since it uses less digits than its factorization.

7942409851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30199540.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 7942409851 is about 89120.1988945267. The cubic root of 7942409851 is about 1995.1892585782.

The spelling of 7942409851 in words is "seven billion, nine hundred forty-two million, four hundred nine thousand, eight hundred fifty-one".