50409999 has 32 divisors (see below), whose sum is σ = 77721600. Its totient is φ = 32257440.

The previous prime is 50409977. The next prime is 50410001. The reversal of 50409999 is 99990405.

It is a happy number.

It is a Cunningham number, because it is equal to 7100²-1.

It is not a de Polignac number, because 50409999 - 2⁹ = 50409487 is a prime.

50409999 is a modest number, since divided by 9999 gives 5040 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50409949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191542 + ... + 191804.

It is an arithmetic number, because the mean of its divisors is an integer number (2428800).

Almost surely, 2^50409999 is an apocalyptic number.

50409999 is a deficient number, since it is larger than the sum of its proper divisors (27311601).

50409999 is a wasteful number, since it uses less digits than its factorization.

50409999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 50409999 is about 7099.9999295775. Note that the first 4 decimals coincide. The cubic root of 50409999 is about 369.4073761206.

The spelling of 50409999 in words is "fifty million, four hundred nine thousand, nine hundred ninety-nine".