7821401 has 8 divisors (see below), whose sum is σ = 9031680. Its totient is φ = 6634368.

The previous prime is 7821397. The next prime is 7821413. The reversal of 7821401 is 1041287.

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

It is a cyclic number.

It is not a de Polignac number, because 7821401 - 2² = 7821397 is a prime.

It is a super-2 number, since 2×7821401² = 122348627205602, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7821461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5081 + ... + 6438.

It is an arithmetic number, because the mean of its divisors is an integer number (1128960).

Almost surely, 2^7821401 is an apocalyptic number.

It is an amenable number.

7821401 is a deficient number, since it is larger than the sum of its proper divisors (1210279).

7821401 is a wasteful number, since it uses less digits than its factorization.

7821401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 7821401 is about 2796.6767778919. The cubic root of 7821401 is about 198.5004599980.

Adding to 7821401 its reverse (1041287), we get a palindrome (8862688).

The spelling of 7821401 in words is "seven million, eight hundred twenty-one thousand, four hundred one".