8452421 has 4 divisors (see below), whose sum is σ = 8460492. Its totient is φ = 8444352.

The previous prime is 8452403. The next prime is 8452439. The reversal of 8452421 is 1242548.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (8452403) and next prime (8452439).

It can be written as a sum of positive squares in 2 ways, for example, as 3568321 + 4884100 = 1889^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 8452421 - 2²² = 4258117 is a prime.

It is a super-2 number, since 2×8452421² = 142886841522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8452441) 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, 2180 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (2115123).

Almost surely, 2^8452421 is an apocalyptic number.

It is an amenable number.

8452421 is a deficient number, since it is larger than the sum of its proper divisors (8071).

8452421 is a wasteful number, since it uses less digits than its factorization.

8452421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070.

The product of its digits is 2560, while the sum is 26.

The square root of 8452421 is about 2907.3047655862. The cubic root of 8452421 is about 203.7012559824.

Adding to 8452421 its reverse (1242548), we get a palindrome (9694969).

The spelling of 8452421 in words is "eight million, four hundred fifty-two thousand, four hundred twenty-one".