3999998 has 16 divisors (see below), whose sum is σ = 6446304.
Its totient is φ = 1854720.
The previous prime is 3999971. The next prime is 4000037. The reversal of 3999998 is 8999993.
It can be divided in two parts, 3 and 999998, that added together give a palindrome (1000001).
It is a happy number.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586 + ... + 3242.
It is an arithmetic number, because the mean of its divisors is an integer number (402894).
Almost surely, 23999998 is an apocalyptic number.
3999998 is a deficient number, since it is larger than the sum of its proper divisors (2446306).
3999998 is a wasteful number, since it uses less digits than its factorization.
3999998 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1747.
The product of its digits is 1417176, while the sum is 56.
The square root of 3999998 is about 1999.9994999999.
Note that the first 3 decimals coincide.
The cubic root of 3999998 is about 158.7400787401.
The spelling of 3999998 in words is "three million, nine hundred ninety-nine thousand, nine hundred ninety-eight".