421399880 has 64 divisors (see below), whose sum is σ = 1036540800. Its totient is φ = 152911360.

The previous prime is 421399877. The next prime is 421399921. The reversal of 421399880 is 88993124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326276 + ... + 327564.

It is an arithmetic number, because the mean of its divisors is an integer number (16195950).

Almost surely, 2^421399880 is an apocalyptic number.

421399880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421399880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518270400).

421399880 is an abundant number, since it is smaller than the sum of its proper divisors (615140920).

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

421399880 is a wasteful number, since it uses less digits than its factorization.

421399880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054 (or 2050 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 421399880 is about 20528.0266952282. The cubic root of 421399880 is about 749.7183416454.

The spelling of 421399880 in words is "four hundred twenty-one million, three hundred ninety-nine thousand, eight hundred eighty".