8421144 has 16 divisors (see below), whose sum is σ = 21052920. Its totient is φ = 2807040.

The previous prime is 8421143. The next prime is 8421167. The reversal of 8421144 is 4411248.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 350881 = 8421144 / (8 + 4 + 2 + 1 + 1 + 4 + 4).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175417 + ... + 175464.

Almost surely, 2^8421144 is an apocalyptic number.

It is an amenable number.

8421144 is an abundant number, since it is smaller than the sum of its proper divisors (12631776).

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

8421144 is a wasteful number, since it uses less digits than its factorization.

8421144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350890 (or 350886 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 8421144 is about 2901.9207432320. The cubic root of 8421144 is about 203.4496894426.

It can be divided in two parts, 84211 and 44, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 8421144 in words is "eight million, four hundred twenty-one thousand, one hundred forty-four".