4007998 has 4 divisors (see below), whose sum is σ = 6012000. Its totient is φ = 2003998.

The previous prime is 4007981. The next prime is 4007999. The reversal of 4007998 is 8997004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4007999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001998 + ... + 1002001.

It is an arithmetic number, because the mean of its divisors is an integer number (1503000).

Almost surely, 2^4007998 is an apocalyptic number.

4007998 is a deficient number, since it is larger than the sum of its proper divisors (2004002).

4007998 is a wasteful number, since it uses less digits than its factorization.

4007998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004001.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 4007998 is about 2001.9985014979. The cubic root of 4007998 is about 158.8458350393.

It can be divided in two parts, 4007 and 998, that added together give a palindrome (5005).

The spelling of 4007998 in words is "four million, seven thousand, nine hundred ninety-eight".