51704399 has 4 divisors (see below), whose sum is σ = 51732336. Its totient is φ = 51676464.

The previous prime is 51704357. The next prime is 51704407. The reversal of 51704399 is 99340715.

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 51704399 - 2⁸ = 51704143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51704099) 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, 10979 + ... + 14964.

It is an arithmetic number, because the mean of its divisors is an integer number (12933084).

Almost surely, 2^51704399 is an apocalyptic number.

51704399 is a deficient number, since it is larger than the sum of its proper divisors (27937).

51704399 is a wasteful number, since it uses less digits than its factorization.

51704399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27936.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 51704399 is about 7190.5770978413. The cubic root of 51704399 is about 372.5425058472.

The spelling of 51704399 in words is "fifty-one million, seven hundred four thousand, three hundred ninety-nine".