7999623947 has 4 divisors (see below), whose sum is σ = 9142427376. Its totient is φ = 6856820520.

The previous prime is 7999623943. The next prime is 7999623959. The reversal of 7999623947 is 7493269997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7493269997 = 31 ⋅241718387.

It is a cyclic number.

It is not a de Polignac number, because 7999623947 - 2² = 7999623943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7999623943) 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, 571401704 + ... + 571401717.

It is an arithmetic number, because the mean of its divisors is an integer number (2285606844).

Almost surely, 2^7999623947 is an apocalyptic number.

7999623947 is a deficient number, since it is larger than the sum of its proper divisors (1142803429).

7999623947 is a wasteful number, since it uses less digits than its factorization.

7999623947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142803428.

The product of its digits is 46294416, while the sum is 65.

The square root of 7999623947 is about 89440.6168751088. The cubic root of 7999623947 is about 1999.9686617590.

The spelling of 7999623947 in words is "seven billion, nine hundred ninety-nine million, six hundred twenty-three thousand, nine hundred forty-seven".