421768840 has 32 divisors (see below), whose sum is σ = 998928000. Its totient is φ = 159827904.

The previous prime is 421768813. The next prime is 421768843. The reversal of 421768840 is 48867124.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 421768793 and 421768802.

It is not an unprimeable number, because it can be changed into a prime (421768843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276720 + ... + 278239.

It is an arithmetic number, because the mean of its divisors is an integer number (31216500).

Almost surely, 2^421768840 is an apocalyptic number.

421768840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421768840 is an abundant number, since it is smaller than the sum of its proper divisors (577159160).

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

421768840 is a wasteful number, since it uses less digits than its factorization.

421768840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554989 (or 554985 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 421768840 is about 20537.0114671049. The cubic root of 421768840 is about 749.9370850928.

The spelling of 421768840 in words is "four hundred twenty-one million, seven hundred sixty-eight thousand, eight hundred forty".