49188721 has 4 divisors (see below), whose sum is σ = 49384944. Its totient is φ = 48992500.

The previous prime is 49188719. The next prime is 49188749. The reversal of 49188721 is 12788194.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12788194 = 2 ⋅6394097.

It is a cyclic number.

It is not a de Polignac number, because 49188721 - 2¹ = 49188719 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49188781) 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, 97735 + ... + 98236.

It is an arithmetic number, because the mean of its divisors is an integer number (12346236).

Almost surely, 2^49188721 is an apocalyptic number.

It is an amenable number.

49188721 is a deficient number, since it is larger than the sum of its proper divisors (196223).

49188721 is a wasteful number, since it uses less digits than its factorization.

49188721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196222.

The product of its digits is 32256, while the sum is 40.

The square root of 49188721 is about 7013.4671169116. The cubic root of 49188721 is about 366.3997568099.

The spelling of 49188721 in words is "forty-nine million, one hundred eighty-eight thousand, seven hundred twenty-one".