7621818 has 16 divisors (see below), whose sum is σ = 15615936. Its totient is φ = 2478560.

The previous prime is 7621813. The next prime is 7621837. The reversal of 7621818 is 8181267.

It is a happy number.

7621818 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

7621818 is a modest number, since divided by 1818 gives 762 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7621813) 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, 15246 + ... + 15737.

It is an arithmetic number, because the mean of its divisors is an integer number (975996).

Almost surely, 2^7621818 is an apocalyptic number.

7621818 is an abundant number, since it is smaller than the sum of its proper divisors (7994118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7621818 is a wasteful number, since it uses less digits than its factorization.

7621818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31029.

The product of its digits is 5376, while the sum is 33.

The square root of 7621818 is about 2760.7640246859. The cubic root of 7621818 is about 196.7974762549.

The spelling of 7621818 in words is "seven million, six hundred twenty-one thousand, eight hundred eighteen".