3902989 has 4 divisors (see below), whose sum is σ = 3943324. Its totient is φ = 3862656.

The previous prime is 3902929. The next prime is 3903001. The reversal of 3902989 is 9892093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9892093 = 23 ⋅430091.

It can be written as a sum of positive squares in 2 ways, for example, as 2377764 + 1525225 = 1542^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 3902989 - 2⁷ = 3902861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3902929) 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, 20022 + ... + 20215.

It is an arithmetic number, because the mean of its divisors is an integer number (985831).

Almost surely, 2^3902989 is an apocalyptic number.

It is an amenable number.

3902989 is a deficient number, since it is larger than the sum of its proper divisors (40335).

3902989 is an equidigital number, since it uses as much as digits as its factorization.

3902989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40334.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 3902989 is about 1975.5983903618. The cubic root of 3902989 is about 157.4462939421.

The spelling of 3902989 in words is "three million, nine hundred two thousand, nine hundred eighty-nine".