7978444 has 12 divisors (see below), whose sum is σ = 14106904. Its totient is φ = 3947904.

The previous prime is 7978441. The next prime is 7978459. The reversal of 7978444 is 4448797.

It is a happy number.

It is a super-2 number, since 2×7978444² = 127311137322272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7978444.

It is not an unprimeable number, because it can be changed into a prime (7978441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9894 + ... + 10669.

Almost surely, 2^7978444 is an apocalyptic number.

It is an amenable number.

7978444 is a deficient number, since it is larger than the sum of its proper divisors (6128460).

7978444 is a wasteful number, since it uses less digits than its factorization.

7978444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20664 (or 20662 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 7978444 is about 2824.6139559239. The cubic root of 7978444 is about 199.8202050840.

The spelling of 7978444 in words is "seven million, nine hundred seventy-eight thousand, four hundred forty-four".