42090987 has 8 divisors (see below), whose sum is σ = 56151360. Its totient is φ = 28045640.

The previous prime is 42090973. The next prime is 42091003. The reversal of 42090987 is 78909024.

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 42090987 - 2⁸ = 42090731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42090787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8464 + ... + 12482.

It is an arithmetic number, because the mean of its divisors is an integer number (7018920).

Almost surely, 2^42090987 is an apocalyptic number.

42090987 is a deficient number, since it is larger than the sum of its proper divisors (14060373).

42090987 is a wasteful number, since it uses less digits than its factorization.

42090987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 42090987 is about 6487.7567001237. The cubic root of 42090987 is about 347.8534939520.

The spelling of 42090987 in words is "forty-two million, ninety thousand, nine hundred eighty-seven".