7903989 has 6 divisors (see below), whose sum is σ = 11416886. Its totient is φ = 5269320.

The previous prime is 7903937. The next prime is 7903991. The reversal of 7903989 is 9893097.

It is a happy number.

7903989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6671889 + 1232100 = 2583^2 + 1110^2 .

It is not a de Polignac number, because 7903989 - 2¹⁷ = 7772917 is a prime.

It is a super-2 number, since 2×7903989² = 124946084224242, which contains 22 as substring.

It is a Duffinian number.

7903989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7903999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439102 + ... + 439119.

Almost surely, 2^7903989 is an apocalyptic number.

It is an amenable number.

7903989 is a deficient number, since it is larger than the sum of its proper divisors (3512897).

7903989 is a wasteful number, since it uses less digits than its factorization.

7903989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878227 (or 878224 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 7903989 is about 2811.4033862112. The cubic root of 7903989 is about 199.1966860870.

The spelling of 7903989 in words is "seven million, nine hundred three thousand, nine hundred eighty-nine".