42721349 has 6 divisors (see below), whose sum is σ = 46958310. Its totient is φ = 38837480.

The previous prime is 42721333. The next prime is 42721361. The reversal of 42721349 is 94312724.

It can be written as a sum of positive squares in only one way, i.e., 38353249 + 4368100 = 6193^2 + 2090^2 .

It is not a de Polignac number, because 42721349 - 2⁴ = 42721333 is a prime.

It is a super-2 number, since 2×42721349² = 3650227320759602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 176414 + ... + 176655.

It is an arithmetic number, because the mean of its divisors is an integer number (7826385).

Almost surely, 2^42721349 is an apocalyptic number.

It is an amenable number.

42721349 is a deficient number, since it is larger than the sum of its proper divisors (4236961).

42721349 is a wasteful number, since it uses less digits than its factorization.

42721349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353091 (or 353080 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 42721349 is about 6536.1570513567. The cubic root of 42721349 is about 349.5814015986.

The spelling of 42721349 in words is "forty-two million, seven hundred twenty-one thousand, three hundred forty-nine".