42909545 has 12 divisors (see below), whose sum is σ = 59898564. Its totient is φ = 29423520.

The previous prime is 42909533. The next prime is 42909553. The reversal of 42909545 is 54590924.

It can be written as a sum of positive squares in 2 ways, for example, as 29506624 + 13402921 = 5432^2 + 3661^2 .

It is not a de Polignac number, because 42909545 - 2¹⁰ = 42908521 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42909499 and 42909508.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87326 + ... + 87815.

It is an arithmetic number, because the mean of its divisors is an integer number (4991547).

Almost surely, 2^42909545 is an apocalyptic number.

It is an amenable number.

42909545 is a deficient number, since it is larger than the sum of its proper divisors (16989019).

42909545 is a wasteful number, since it uses less digits than its factorization.

42909545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175160 (or 175153 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 42909545 is about 6550.5377641839. The cubic root of 42909545 is about 350.0939747656.

The spelling of 42909545 in words is "forty-two million, nine hundred nine thousand, five hundred forty-five".