7878401 has 8 divisors (see below), whose sum is σ = 8185320. Its totient is φ = 7573888.

The previous prime is 7878391. The next prime is 7878413. The reversal of 7878401 is 1048787.

It can be written as a sum of positive squares in 4 ways, for example, as 1123600 + 6754801 = 1060^2 + 2599^2 .

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 7878401 - 2⁶ = 7878337 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878421) 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, 8765 + ... + 9621.

It is an arithmetic number, because the mean of its divisors is an integer number (1023165).

Almost surely, 2^7878401 is an apocalyptic number.

It is an amenable number.

7878401 is a deficient number, since it is larger than the sum of its proper divisors (306919).

7878401 is a wasteful number, since it uses less digits than its factorization.

7878401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 7878401 is about 2806.8489449915. The cubic root of 7878401 is about 198.9814970634.

The spelling of 7878401 in words is "seven million, eight hundred seventy-eight thousand, four hundred one".