51404399 has 8 divisors (see below), whose sum is σ = 52523520. Its totient is φ = 50293656.

The previous prime is 51404371. The next prime is 51404401. The reversal of 51404399 is 99340415.

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

It is a cyclic number.

It is not a de Polignac number, because 51404399 - 2¹² = 51400303 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 (51404099) 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, 11204 + ... + 15110.

It is an arithmetic number, because the mean of its divisors is an integer number (6565440).

Almost surely, 2^51404399 is an apocalyptic number.

51404399 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

51404399 is a deficient number, since it is larger than the sum of its proper divisors (1119121).

51404399 is a wasteful number, since it uses less digits than its factorization.

51404399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 51404399 is about 7169.6861158631. The cubic root of 51404399 is about 371.8205839828.

The spelling of 51404399 in words is "fifty-one million, four hundred four thousand, three hundred ninety-nine".