3988739 has 4 divisors (see below), whose sum is σ = 4117440. Its totient is φ = 3860040.

The previous prime is 3988717. The next prime is 3988753. The reversal of 3988739 is 9378893.

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 3988739 - 2¹⁶ = 3923203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3988693 and 3988702.

It is not an unprimeable number, because it can be changed into a prime (3988759) 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, 64304 + ... + 64365.

It is an arithmetic number, because the mean of its divisors is an integer number (1029360).

Almost surely, 2^3988739 is an apocalyptic number.

3988739 is a deficient number, since it is larger than the sum of its proper divisors (128701).

3988739 is a wasteful number, since it uses less digits than its factorization.

3988739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128700.

The product of its digits is 326592, while the sum is 47.

The square root of 3988739 is about 1997.1827657979. The cubic root of 3988739 is about 158.5910008267.

The spelling of 3988739 in words is "three million, nine hundred eighty-eight thousand, seven hundred thirty-nine".