49721993 has 4 divisors (see below), whose sum is σ = 52338960. Its totient is φ = 47105028.

The previous prime is 49721989. The next prime is 49721999. The reversal of 49721993 is 39912794.

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: 39912794 = 2 ⋅19956397.

It is not a de Polignac number, because 49721993 - 2² = 49721989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49721999) 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, 1308455 + ... + 1308492.

It is an arithmetic number, because the mean of its divisors is an integer number (13084740).

Almost surely, 2^49721993 is an apocalyptic number.

It is an amenable number.

49721993 is a deficient number, since it is larger than the sum of its proper divisors (2616967).

49721993 is a wasteful number, since it uses less digits than its factorization.

49721993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616966.

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

The square root of 49721993 is about 7051.3823467459. The cubic root of 49721993 is about 367.7190894394.

The spelling of 49721993 in words is "forty-nine million, seven hundred twenty-one thousand, nine hundred ninety-three".