42809619 has 8 divisors (see below), whose sum is σ = 57126352. Its totient is φ = 28516320.

The previous prime is 42809593. The next prime is 42809651. The reversal of 42809619 is 91690824.

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

It is not a de Polignac number, because 42809619 - 2⁸ = 42809363 is a prime.

It is a super-2 number, since 2×42809619² = 3665326957850322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42809219) 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, 1024 + ... + 9309.

It is an arithmetic number, because the mean of its divisors is an integer number (7140794).

Almost surely, 2^42809619 is an apocalyptic number.

42809619 is a deficient number, since it is larger than the sum of its proper divisors (14316733).

42809619 is a wasteful number, since it uses less digits than its factorization.

42809619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11717.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 42809619 is about 6542.9060057439. The cubic root of 42809619 is about 349.8220020087.

The spelling of 42809619 in words is "forty-two million, eight hundred nine thousand, six hundred nineteen".