8521401 has 8 divisors (see below), whose sum is σ = 12985024. Its totient is φ = 4869360.

The previous prime is 8521397. The next prime is 8521411. The reversal of 8521401 is 1041258.

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

It is not a de Polignac number, because 8521401 - 2² = 8521397 is a prime.

It is a super-2 number, since 2×8521401² = 145228550005602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 405781 = 8521401 / (8 + 5 + 2 + 1 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202870 + ... + 202911.

It is an arithmetic number, because the mean of its divisors is an integer number (1623128).

Almost surely, 2^8521401 is an apocalyptic number.

It is an amenable number.

8521401 is a deficient number, since it is larger than the sum of its proper divisors (4463623).

8521401 is a wasteful number, since it uses less digits than its factorization.

8521401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405791.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 8521401 is about 2919.1438813460. The cubic root of 8521401 is about 204.2538890038.

Adding to 8521401 its reverse (1041258), we get a palindrome (9562659).

The spelling of 8521401 in words is "eight million, five hundred twenty-one thousand, four hundred one".