43421004 has 144 divisors (see below), whose sum is σ = 131040000. Its totient is φ = 11975040.

The previous prime is 43420969. The next prime is 43421039. The reversal of 43421004 is 40012434.

It is an interprime number because it is at equal distance from previous prime (43420969) and next prime (43421039).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218097 + ... + 218295.

It is an arithmetic number, because the mean of its divisors is an integer number (910000).

Almost surely, 2^43421004 is an apocalyptic number.

43421004 is a gapful number since it is divisible by the number (44) 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 43421004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65520000).

43421004 is an abundant number, since it is smaller than the sum of its proper divisors (87618996).

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

43421004 is a wasteful number, since it uses less digits than its factorization.

43421004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 43421004 is about 6589.4615865031. The cubic root of 43421004 is about 351.4794626167.

Adding to 43421004 its reverse (40012434), we get a palindrome (83433438).

The spelling of 43421004 in words is "forty-three million, four hundred twenty-one thousand, four".