42509389 has 8 divisors (see below), whose sum is σ = 47358360. Its totient is φ = 37886016.

The previous prime is 42509381. The next prime is 42509407. The reversal of 42509389 is 98390524.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2402500 + 40106889 = 1550^2 + 6333^2 .

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 42509389 - 2³ = 42509381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42509381) 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, 56002 + ... + 56755.

It is an arithmetic number, because the mean of its divisors is an integer number (5919795).

Almost surely, 2^42509389 is an apocalyptic number.

It is an amenable number.

42509389 is a deficient number, since it is larger than the sum of its proper divisors (4848971).

42509389 is a wasteful number, since it uses less digits than its factorization.

42509389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112799.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 42509389 is about 6519.9224688642. The cubic root of 42509389 is about 349.0022988166.

The spelling of 42509389 in words is "forty-two million, five hundred nine thousand, three hundred eighty-nine".