7984399 has 2 divisors, whose sum is σ = 7984400. Its totient is φ = 7984398.

The previous prime is 7984387. The next prime is 7984409. The reversal of 7984399 is 9934897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7984399 - 2¹⁹ = 7460111 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 9 + 8⁷ + 4⁶ + 3⁵ + 9⁵ + 9⁵ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7984349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992199 + 3992200.

It is an arithmetic number, because the mean of its divisors is an integer number (3992200).

Almost surely, 2^7984399 is an apocalyptic number.

7984399 is a deficient number, since it is larger than the sum of its proper divisors (1).

7984399 is an equidigital number, since it uses as much as digits as its factorization.

7984399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 7984399 is about 2825.6678856511. The cubic root of 7984399 is about 199.8699070642.

The spelling of 7984399 in words is "seven million, nine hundred eighty-four thousand, three hundred ninety-nine".