420887 has 4 divisors (see below), whose sum is σ = 434496. Its totient is φ = 407280.

The previous prime is 420859. The next prime is 420899. The reversal of 420887 is 788024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420887 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420857) 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, 6758 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (108624).

2⁴²⁰⁸⁸⁷ is an apocalyptic number.

420887 is a deficient number, since it is larger than the sum of its proper divisors (13609).

420887 is a wasteful number, since it uses less digits than its factorization.

420887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13608.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 420887 is about 648.7580442661. The cubic root of 420887 is about 74.9414060872.

The spelling of 420887 in words is "four hundred twenty thousand, eight hundred eighty-seven".