421980 has 48 divisors (see below), whose sum is σ = 1274784. Its totient is φ = 103680.

The previous prime is 421973. The next prime is 421987. The reversal of 421980 is 89124.

It is an interprime number because it is at equal distance from previous prime (421973) and next prime (421987).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 421980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421987) by changing a digit.

421980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510 + ... + 1050.

It is an arithmetic number, because the mean of its divisors is an integer number (26558).

2⁴²¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637392).

421980 is an abundant number, since it is smaller than the sum of its proper divisors (852804).

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

421980 is a wasteful number, since it uses less digits than its factorization.

421980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 421980 is about 649.5998768473. The cubic root of 421980 is about 75.0062217061.

The spelling of 421980 in words is "four hundred twenty-one thousand, nine hundred eighty".