3913989 has 8 divisors (see below), whose sum is σ = 5340192. Its totient is φ = 2548560.

The previous prime is 3913969. The next prime is 3913991. The reversal of 3913989 is 9893193.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3913989 - 2¹⁵ = 3881221 is a prime.

It is an Ulam number.

3913989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3913989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3913969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15042 + ... + 15299.

It is an arithmetic number, because the mean of its divisors is an integer number (667524).

Almost surely, 2^3913989 is an apocalyptic number.

It is an amenable number.

3913989 is a deficient number, since it is larger than the sum of its proper divisors (1426203).

3913989 is a wasteful number, since it uses less digits than its factorization.

3913989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30387.

The product of its digits is 52488, while the sum is 42.

The square root of 3913989 is about 1978.3803982046. The cubic root of 3913989 is about 157.5940682703.

It can be divided in two parts, 39 and 13989, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 3913989 in words is "three million, nine hundred thirteen thousand, nine hundred eighty-nine".