42721519 has 8 divisors (see below), whose sum is σ = 45200000. Its totient is φ = 40266072.

The previous prime is 42721517. The next prime is 42721529. The reversal of 42721519 is 91512724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42721519 - 2¹ = 42721517 is a prime.

It is a super-2 number, since 2×42721519² = 3650256371334722, 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 (42721517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1869 + ... + 9430.

It is an arithmetic number, because the mean of its divisors is an integer number (5650000).

Almost surely, 2^42721519 is an apocalyptic number.

42721519 is a deficient number, since it is larger than the sum of its proper divisors (2478481).

42721519 is a wasteful number, since it uses less digits than its factorization.

42721519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11517.

The product of its digits is 5040, while the sum is 31.

The square root of 42721519 is about 6536.1700559272. The cubic root of 42721519 is about 349.5818652915.

The spelling of 42721519 in words is "forty-two million, seven hundred twenty-one thousand, five hundred nineteen".