84400249 has 4 divisors (see below), whose sum is σ = 84418660. Its totient is φ = 84381840.

The previous prime is 84400247. The next prime is 84400319. The reversal of 84400249 is 94200448.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 51222649 + 33177600 = 7157^2 + 5760^2 .

It is a cyclic number.

It is not a de Polignac number, because 84400249 - 2¹ = 84400247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84400249.

It is not an unprimeable number, because it can be changed into a prime (84400243) 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, 3739 + ... + 13519.

It is an arithmetic number, because the mean of its divisors is an integer number (21104665).

Almost surely, 2^84400249 is an apocalyptic number.

It is an amenable number.

84400249 is a deficient number, since it is larger than the sum of its proper divisors (18411).

84400249 is an equidigital number, since it uses as much as digits as its factorization.

84400249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18410.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 84400249 is about 9186.9608141104. The cubic root of 84400249 is about 438.6464066050.

The spelling of 84400249 in words is "eighty-four million, four hundred thousand, two hundred forty-nine".