3998778 has 32 divisors (see below), whose sum is σ = 9623040. Its totient is φ = 1082160.

The previous prime is 3998773. The next prime is 3998779. The reversal of 3998778 is 8778993.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3998778.

It is not an unprimeable number, because it can be changed into a prime (3998773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1708 + ... + 3303.

It is an arithmetic number, because the mean of its divisors is an integer number (300720).

Almost surely, 2^3998778 is an apocalyptic number.

3998778 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3998778 is an abundant number, since it is smaller than the sum of its proper divisors (5624262).

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

3998778 is a wasteful number, since it uses less digits than its factorization.

3998778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042.

The product of its digits is 762048, while the sum is 51.

The square root of 3998778 is about 1999.6944766639. The cubic root of 3998778 is about 158.7239385164.

The spelling of 3998778 in words is "three million, nine hundred ninety-eight thousand, seven hundred seventy-eight".