49857209 has 4 divisors (see below), whose sum is σ = 52790004. Its totient is φ = 46924416.

The previous prime is 49857163. The next prime is 49857211. The reversal of 49857209 is 90275894.

It is a happy number.

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 27008809 + 22848400 = 5197^2 + 4780^2 .

It is a cyclic number.

It is not a de Polignac number, because 49857209 - 2¹² = 49853113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49857209.

It is not an unprimeable number, because it can be changed into a prime (49857109) 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, 1466372 + ... + 1466405.

It is an arithmetic number, because the mean of its divisors is an integer number (13197501).

Almost surely, 2^49857209 is an apocalyptic number.

It is an amenable number.

49857209 is a deficient number, since it is larger than the sum of its proper divisors (2932795).

49857209 is a wasteful number, since it uses less digits than its factorization.

49857209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932794.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 49857209 is about 7060.9637444190. The cubic root of 49857209 is about 368.0521177957.

The spelling of 49857209 in words is "forty-nine million, eight hundred fifty-seven thousand, two hundred nine".