84999947 has 4 divisors (see below), whose sum is σ = 85022640. Its totient is φ = 84977256.

The previous prime is 84999931. The next prime is 84999979. The reversal of 84999947 is 74999948.

It is a happy number.

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 84999947 - 2⁴ = 84999931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84999907) 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, 4247 + ... + 13712.

It is an arithmetic number, because the mean of its divisors is an integer number (21255660).

Almost surely, 2^84999947 is an apocalyptic number.

84999947 is a deficient number, since it is larger than the sum of its proper divisors (22693).

84999947 is a wasteful number, since it uses less digits than its factorization.

84999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22692.

The product of its digits is 5878656, while the sum is 59.

The square root of 84999947 is about 9219.5415829639. The cubic root of 84999947 is about 439.6828758307.

Subtracting from 84999947 its reverse (74999948), we obtain a palindrome (9999999).

The spelling of 84999947 in words is "eighty-four million, nine hundred ninety-nine thousand, nine hundred forty-seven".