42087409 has 8 divisors (see below), whose sum is σ = 51800000. Its totient is φ = 33299856.

The previous prime is 42087403. The next prime is 42087431. The reversal of 42087409 is 90478024.

It is a happy number.

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 42087409 - 2⁷ = 42087281 is a prime.

It is a super-3 number, since 3×42087409³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42087403) 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, 231159 + ... + 231340.

It is an arithmetic number, because the mean of its divisors is an integer number (6475000).

Almost surely, 2^42087409 is an apocalyptic number.

It is an amenable number.

42087409 is a deficient number, since it is larger than the sum of its proper divisors (9712591).

42087409 is a wasteful number, since it uses less digits than its factorization.

42087409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462519.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 42087409 is about 6487.4809440953. The cubic root of 42087409 is about 347.8436370907.

The spelling of 42087409 in words is "forty-two million, eighty-seven thousand, four hundred nine".