421659 has 32 divisors (see below), whose sum is σ = 752640. Its totient is φ = 228096.

The previous prime is 421657. The next prime is 421661. The reversal of 421659 is 956124.

421659 = 167² + 168² + ... + 180².

421659 is a `hidden beast` number, since 4 + 2 + 1 + 659 = 666.

It is an interprime number because it is at equal distance from previous prime (421657) and next prime (421661).

It is not a de Polignac number, because 421659 - 2¹ = 421657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (421657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4299 + ... + 4395.

It is an arithmetic number, because the mean of its divisors is an integer number (23520).

2⁴²¹⁶⁵⁹ is an apocalyptic number.

421659 is a deficient number, since it is larger than the sum of its proper divisors (330981).

421659 is a wasteful number, since it uses less digits than its factorization.

421659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 130 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 421659 is about 649.3527546719. The cubic root of 421659 is about 74.9871978148.

The spelling of 421659 in words is "four hundred twenty-one thousand, six hundred fifty-nine".