7899947 has 8 divisors (see below), whose sum is σ = 8896512. Its totient is φ = 6949800.

The previous prime is 7899929. The next prime is 7899949. The reversal of 7899947 is 7499987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7899947 - 2¹⁰ = 7898923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7899949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11243 + ... + 11924.

It is an arithmetic number, because the mean of its divisors is an integer number (1112064).

Almost surely, 2^7899947 is an apocalyptic number.

7899947 is a deficient number, since it is larger than the sum of its proper divisors (996565).

7899947 is a wasteful number, since it uses less digits than its factorization.

7899947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23209.

The product of its digits is 1143072, while the sum is 53.

The square root of 7899947 is about 2810.6844362183. The cubic root of 7899947 is about 199.1627247420.

The spelling of 7899947 in words is "seven million, eight hundred ninety-nine thousand, nine hundred forty-seven".