442190987 has 4 divisors (see below), whose sum is σ = 505361136. Its totient is φ = 379020840.

The previous prime is 442190981. The next prime is 442190999. The reversal of 442190987 is 789091244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 442190987 - 2⁶ = 442190923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442190981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31585064 + ... + 31585077.

It is an arithmetic number, because the mean of its divisors is an integer number (126340284).

Almost surely, 2^442190987 is an apocalyptic number.

442190987 is a deficient number, since it is larger than the sum of its proper divisors (63170149).

442190987 is an equidigital number, since it uses as much as digits as its factorization.

442190987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63170148.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 442190987 is about 21028.3377136663. The cubic root of 442190987 is about 761.8508599396.

The spelling of 442190987 in words is "four hundred forty-two million, one hundred ninety thousand, nine hundred eighty-seven".