7720401 has 8 divisors (see below), whose sum is σ = 11085760. Its totient is φ = 4750992.

The previous prime is 7720399. The next prime is 7720429. The reversal of 7720401 is 1040277.

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

It is not a de Polignac number, because 7720401 - 2¹ = 7720399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720451) 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, 98941 + ... + 99018.

It is an arithmetic number, because the mean of its divisors is an integer number (1385720).

Almost surely, 2^7720401 is an apocalyptic number.

It is an amenable number.

7720401 is a deficient number, since it is larger than the sum of its proper divisors (3365359).

7720401 is a wasteful number, since it uses less digits than its factorization.

7720401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197975.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 7720401 is about 2778.5609584819. The cubic root of 7720401 is about 197.6423243737.

Adding to 7720401 its reverse (1040277), we get a palindrome (8760678).

The spelling of 7720401 in words is "seven million, seven hundred twenty thousand, four hundred one".