49721409 has 6 divisors (see below), whose sum is σ = 71819826. Its totient is φ = 33147600.

The previous prime is 49721407. The next prime is 49721467. The reversal of 49721409 is 90412794.

It can be written as a sum of positive squares in only one way, i.e., 36869184 + 12852225 = 6072^2 + 3585^2 .

It is not a de Polignac number, because 49721409 - 2¹ = 49721407 is a prime.

It is a super-3 number, since 3×49721409³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (49721407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2762292 + ... + 2762309.

It is an arithmetic number, because the mean of its divisors is an integer number (11969971).

Almost surely, 2^49721409 is an apocalyptic number.

It is an amenable number.

49721409 is a deficient number, since it is larger than the sum of its proper divisors (22098417).

49721409 is a wasteful number, since it uses less digits than its factorization.

49721409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524607 (or 5524604 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 49721409 is about 7051.3409363042. The cubic root of 49721409 is about 367.7176497760.

The spelling of 49721409 in words is "forty-nine million, seven hundred twenty-one thousand, four hundred nine".