3938889 has 4 divisors (see below), whose sum is σ = 5251856. Its totient is φ = 2625924.

The previous prime is 3938839. The next prime is 3938897. The reversal of 3938889 is 9888393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3938889 - 2⁸ = 3938633 is a prime.

It is a super-3 number, since 3×3938889³ (a number of 21 digits) contains 333 as substring.

It is a D-number.

It is a Duffinian number.

3938889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3938839) 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, 656479 + ... + 656484.

It is an arithmetic number, because the mean of its divisors is an integer number (1312964).

Almost surely, 2^3938889 is an apocalyptic number.

It is an amenable number.

3938889 is a deficient number, since it is larger than the sum of its proper divisors (1312967).

3938889 is a wasteful number, since it uses less digits than its factorization.

3938889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312966.

The product of its digits is 373248, while the sum is 48.

The square root of 3938889 is about 1984.6634475397. The cubic root of 3938889 is about 157.9275558505.

The spelling of 3938889 in words is "three million, nine hundred thirty-eight thousand, eight hundred eighty-nine".