49921857 has 12 divisors (see below), whose sum is σ = 72249684. Its totient is φ = 33216480.

The previous prime is 49921831. The next prime is 49921867. The reversal of 49921857 is 75812994.

It can be written as a sum of positive squares in 2 ways, for example, as 12173121 + 37748736 = 3489^2 + 6144^2 .

It is not a de Polignac number, because 49921857 - 2⁶ = 49921793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49921867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258 + ... + 9995.

It is an arithmetic number, because the mean of its divisors is an integer number (6020807).

Almost surely, 2^49921857 is an apocalyptic number.

It is an amenable number.

49921857 is a deficient number, since it is larger than the sum of its proper divisors (22327827).

49921857 is a wasteful number, since it uses less digits than its factorization.

49921857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800 (or 10797 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 49921857 is about 7065.5401067434. The cubic root of 49921857 is about 368.2111289464.

The spelling of 49921857 in words is "forty-nine million, nine hundred twenty-one thousand, eight hundred fifty-seven".