4287921 has 8 divisors (see below), whose sum is σ = 6237024. Its totient is φ = 2598720.

The previous prime is 4287919. The next prime is 4287923. The reversal of 4287921 is 1297824.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4287919) and next prime (4287923).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4287921 - 2¹ = 4287919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 129937 = 4287921 / (4 + 2 + 8 + 7 + 9 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4287923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64936 + ... + 65001.

It is an arithmetic number, because the mean of its divisors is an integer number (779628).

Almost surely, 2^4287921 is an apocalyptic number.

It is an amenable number.

4287921 is a deficient number, since it is larger than the sum of its proper divisors (1949103).

4287921 is a wasteful number, since it uses less digits than its factorization.

4287921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129951.

The product of its digits is 8064, while the sum is 33.

The square root of 4287921 is about 2070.7295815726. The cubic root of 4287921 is about 162.4609263055.

The spelling of 4287921 in words is "four million, two hundred eighty-seven thousand, nine hundred twenty-one".