49639805 has 4 divisors (see below), whose sum is σ = 59567772. Its totient is φ = 39711840.

The previous prime is 49639801. The next prime is 49639817. The reversal of 49639805 is 50893694.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6461764 + 43178041 = 2542^2 + 6571^2 .

It is not a de Polignac number, because 49639805 - 2² = 49639801 is a prime.

It is a super-2 number, since 2×49639805² = 4928220480876050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49639801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4963976 + ... + 4963985.

It is an arithmetic number, because the mean of its divisors is an integer number (14891943).

Almost surely, 2^49639805 is an apocalyptic number.

It is an amenable number.

49639805 is a deficient number, since it is larger than the sum of its proper divisors (9927967).

49639805 is an equidigital number, since it uses as much as digits as its factorization.

49639805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9927966.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 49639805 is about 7045.5521430190. The cubic root of 49639805 is about 367.5163705358.

The spelling of 49639805 in words is "forty-nine million, six hundred thirty-nine thousand, eight hundred five".