49807821 has 8 divisors (see below), whose sum is σ = 75897664. Its totient is φ = 28461600.

The previous prime is 49807817. The next prime is 49807829. The reversal of 49807821 is 12870894.

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

It is not a de Polignac number, because 49807821 - 2² = 49807817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 49807821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49807829) 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, 1185880 + ... + 1185921.

It is an arithmetic number, because the mean of its divisors is an integer number (9487208).

Almost surely, 2^49807821 is an apocalyptic number.

It is an amenable number.

49807821 is a deficient number, since it is larger than the sum of its proper divisors (26089843).

49807821 is a wasteful number, since it uses less digits than its factorization.

49807821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371811.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 49807821 is about 7057.4656215953. The cubic root of 49807821 is about 367.9305481922.

The spelling of 49807821 in words is "forty-nine million, eight hundred seven thousand, eight hundred twenty-one".