42721719 has 4 divisors (see below), whose sum is σ = 56962296. Its totient is φ = 28481144.

The previous prime is 42721711. The next prime is 42721733. The reversal of 42721719 is 91712724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42721719 - 2³ = 42721711 is a prime.

It is a super-2 number, since 2×42721719² = 3650290548629922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42721719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721711) 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, 7120284 + ... + 7120289.

It is an arithmetic number, because the mean of its divisors is an integer number (14240574).

Almost surely, 2^42721719 is an apocalyptic number.

42721719 is a deficient number, since it is larger than the sum of its proper divisors (14240577).

42721719 is a wasteful number, since it uses less digits than its factorization.

42721719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14240576.

The product of its digits is 7056, while the sum is 33.

The square root of 42721719 is about 6536.1853553889. The cubic root of 42721719 is about 349.5824108110.

The spelling of 42721719 in words is "forty-two million, seven hundred twenty-one thousand, seven hundred nineteen".