3998751 has 4 divisors (see below), whose sum is σ = 5331672. Its totient is φ = 2665832.

The previous prime is 3998749. The next prime is 3998773. The reversal of 3998751 is 1578993.

It is a happy number.

3998751 is nontrivially palindromic in base 4.

3998751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3998751 - 2¹ = 3998749 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666456 + ... + 666461.

It is an arithmetic number, because the mean of its divisors is an integer number (1332918).

Almost surely, 2^3998751 is an apocalyptic number.

3998751 is a deficient number, since it is larger than the sum of its proper divisors (1332921).

3998751 is a wasteful number, since it uses less digits than its factorization.

3998751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332920.

The product of its digits is 68040, while the sum is 42.

The square root of 3998751 is about 1999.6877256212. The cubic root of 3998751 is about 158.7235812776.

It can be divided in two parts, 39 and 98751, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 3998751 in words is "three million, nine hundred ninety-eight thousand, seven hundred fifty-one".