421956 has 24 divisors (see below), whose sum is σ = 1094240. Its totient is φ = 140616.

The previous prime is 421943. The next prime is 421973. The reversal of 421956 is 659124.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1846 + ... + 2061.

2⁴²¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

421956 is an abundant number, since it is smaller than the sum of its proper divisors (672284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421956 is a wasteful number, since it uses less digits than its factorization.

421956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920 (or 3912 counting only the distinct ones).

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

The square root of 421956 is about 649.5814036747. The cubic root of 421956 is about 75.0047996928.

The spelling of 421956 in words is "four hundred twenty-one thousand, nine hundred fifty-six".