49399721 has 4 divisors (see below), whose sum is σ = 56456832. Its totient is φ = 42342612.

The previous prime is 49399687. The next prime is 49399729. The reversal of 49399721 is 12799394.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49399721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49399729) 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, 3528545 + ... + 3528558.

It is an arithmetic number, because the mean of its divisors is an integer number (14114208).

Almost surely, 2^49399721 is an apocalyptic number.

It is an amenable number.

49399721 is a deficient number, since it is larger than the sum of its proper divisors (7057111).

49399721 is an equidigital number, since it uses as much as digits as its factorization.

49399721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7057110.

The product of its digits is 122472, while the sum is 44.

The square root of 49399721 is about 7028.4935085692. The cubic root of 49399721 is about 366.9229124323.

The spelling of 49399721 in words is "forty-nine million, three hundred ninety-nine thousand, seven hundred twenty-one".