442505687 has 16 divisors (see below), whose sum is σ = 517816320. Its totient is φ = 374479200.

The previous prime is 442505663. The next prime is 442505711. The reversal of 442505687 is 786505244.

It is an interprime number because it is at equal distance from previous prime (442505663) and next prime (442505711).

It is a cyclic number.

It is not a de Polignac number, because 442505687 - 2⁸ = 442505431 is a prime.

It is a super-2 number, since 2×442505687² = 391622566054683938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442505617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21239 + ... + 36552.

It is an arithmetic number, because the mean of its divisors is an integer number (32363520).

Almost surely, 2^442505687 is an apocalyptic number.

442505687 is a deficient number, since it is larger than the sum of its proper divisors (75310633).

442505687 is a wasteful number, since it uses less digits than its factorization.

442505687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57854.

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 442505687 is about 21035.8191425958. The cubic root of 442505687 is about 762.0315492939.

The spelling of 442505687 in words is "four hundred forty-two million, five hundred five thousand, six hundred eighty-seven".