50409989 has 4 divisors (see below), whose sum is σ = 57611424. Its totient is φ = 43208556.

The previous prime is 50409977. The next prime is 50410001. The reversal of 50409989 is 98990405.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (50409977) and next prime (50410001).

It is a cyclic number.

It is not a de Polignac number, because 50409989 - 2¹⁶ = 50344453 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 (50409949) 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, 3600707 + ... + 3600720.

It is an arithmetic number, because the mean of its divisors is an integer number (14402856).

Almost surely, 2^50409989 is an apocalyptic number.

It is an amenable number.

50409989 is a deficient number, since it is larger than the sum of its proper divisors (7201435).

50409989 is an equidigital number, since it uses as much as digits as its factorization.

50409989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7201434.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 50409989 is about 7099.9992253521. Note that the first 3 decimals coincide. The cubic root of 50409989 is about 369.4073516937.

The spelling of 50409989 in words is "fifty million, four hundred nine thousand, nine hundred eighty-nine".